* states: add MoveAbsResource and MoveAbsResourceInstance state functions and corresponding syncState wrapper functions.

* states: add MoveModuleInstance and MaybeMoveModuleInstance

* addrs: adding a new function, ModuleInstance.IsDeclaredByCall, which returns true if the receiver is an instance of the given AbsModuleCall.

Add comments explaining how ctySequenceDiff works

Add deploy information to website folder readme

json-output: Add resource drift to machine readable UI

Co-authored-by: Tu Nguyen <im2nguyen@users.noreply.github.com>

* website: Update or remove references to legacy provider docs

We've finally evicted the last of the legacy provider docs from terraform.io!
Let's celebrate by purging all memory of them.

The 0.11 docs are now so thoroughly legacy that I don't believe they need a new
destination for their provider links, so I just removed those.

* website: remove old provider docs index

This will require a redirect in the terraform-website repo.

* Apply suggestions from code review
Co-authored-by: Laura Pacilio <83350965+laurapacilio@users.noreply.github.com>
Co-authored-by: Laura Pacilio <83350965+laurapacilio@users.noreply.github.com>

The logic behind this code took me a while to understand, so I wrote
down what I understand to be the reasoning behind how it works. The
trickiest part is rendering changing objects as updates. I think the
other pieces are fairly common to LCS sequence diff rendering, so I
didn't explain those in detail.

Link refresh tutorial from plan and refresh docs pages

update go-cty to v1.9.0

Add compatibility promises to sidebar toc

Add instructions to preview docs site locally to /website readme

Co-authored-by: Tu Nguyen <im2nguyen@users.noreply.github.com>

Co-authored-by: Tu Nguyen <im2nguyen@users.noreply.github.com>

Co-authored-by: Tu Nguyen <im2nguyen@users.noreply.github.com>

Add page metadata

An earlier commit added logic to decode "moved" blocks and do static
validation of them. Here we now include that result also in modules
produced from those files, which we can then use in Terraform Core to
actually implement the moves.

This also places the feature behind an active experiment keyword called
config_driven_move. For now activating this doesn't actually achieve
anything except let you include moved blocks that Terraform will summarily
ignore, but we'll expand the scope of this in later commits to eventually
reach the point where it's really usable.

A common source of churn when we're running experiments is that a module
that would otherwise be valid ends up generating a warning merely because
the experiment is active. That means we end up needing to shuffle the
test files around if the feature ultimately graduates to stable.

To reduce that churn in simple cases, we'll make an exception to disregard
the "Experiment is active" warning for any experiment that a module has
intentionally opted into, because those warnings are always expected and
not a cause for concern.

It's still possible to test those warnings explicitly using the
testdata/warning-files directory, if needed.

Although addrs.Target can in principle capture the information we need to
represent move endpoints, it's semantically confusing because
addrs.Targetable uses addrs.Abs... types which are typically for absolute
addresses, but we were using them for relative addresses here.

We now have specialized address types for representing moves and probably
other things which have similar requirements later on. These types
largely communicate the same information in the end, but aim to do so in
a way that's explicit about which addresses are relative and which are
absolute, to make it less likely that we'd inadvertently misuse these
addresses.

These three types represent the three different address representations we
need to represent different stages of analysis for "moved" blocks in the
configuration.

The goal here is to encapsulate all of the static address wrangling inside
these types so that users of these types elsewhere would have to work
pretty hard to use them incorrectly.

In particular, the MovableEndpoint type intentionally fully encapsulates
the weird relative addresses we use in configuration so that code
elsewhere in Terraform can never end up holding an address of a type that
suggests absolute when it's actually relative. That situation only occurs
in the internals of MoveableEndpoint where we use not-really-absolute
AbsMoveable address types to represent the not-yet-resolved relative
addresses.

This only takes care of the static address wrangling. There's lots of
other rules for what makes a "moved" block valid which will need to be
checked elsewhere because they require more context than just the content
of the address itself.

Our documentation for ModuleCall originally asserted that we didn't need
AbsModuleCall because ModuleInstance captured the same information, but
when we added count and for_each for modules we introduced
ModuleCallInstance to represent a reference to an instance of a local
module call, and now _that_ is the type whose absolute equivalent is
ModuleInstance.

We previously had no absolute representation of the call itself, without
any particular instance. That's what AbsModuleCall now represents,
allowing us to be explicit about when we're talking about the module block
vs. instances it declares, which is the same distinction represented by
AbsResource vs. AbsResourceInstance.

Just like with AbsResource and AbsResourceInstance though, there is
syntactic ambiguity between a no-key call instance and a whole module call,
and so some codepaths might accept both to start and then use other
context to dynamically choose a particular interpretation, in which case
this distinction becomes meaningful in representing the result of that
decision.

The previous name didn't fit with the naming scheme for addrs types:
The "Abs" prefix typically means that it's an addrs.ModuleInstance
combined with whatever type name appears after "Abs", but this is instead
a ModuleCallOutput combined with an InstanceKey, albeit structured the
other way around for convenience, and so the expected name for this would
be the suffix "Instance".

We don't have an "Abs" type corresponding with this one because it would
represent no additional information than AbsOutputValue.

Co-authored-by: Judith Malnick <judith.patudith@gmail.com>

Build darwin/arm64 (RELENG-650)