- Create constraint procedures has infrastructure and signature updated
  but since support is still lacking in Kernel API they will see support
  for index config later.
- Introduce IndexSettingUtil that can be used to:
  - Get IndexSetting from name.
  - Convert Map<IndexSetting,Object> -> IndexConfig
  - Convert Map<String,Object> -> IndexConfig
  - Parse an Object value as a specific value type. This is useful
    because when passing index config to procedure as a map user is not
    in control over what specific type those values will have at
    runtime.

This tool can be used to check structural consistency of an individual
GBPTree.

Eager resolution of tx state causing tons of problems with rest calls in clustering env. since accessing the state will perform epoch validation.

Remove statement acquire from token operations and change token methods to return Iterable instead of ResourceIterable.

Change sampling to be async by default in IndexSamplingController.
Small cleanup around RecoveryCondition.

Make it possible to attach index configuration to the indexes behind index-backed constraints, via Core API.

Do more validation of the given index prototype and schema when creating an index-backed constraint.

This lets us specify the index type of the uniqueness indexes behind index backed constraints.
It also clears the path for setting index configurations on these indexes.

The kernel API needs to be refactored before a proper implementation is possible, though.

The FulltextIndexProvider now verifies that index prototypes have archetypal full-text schemas during index create validation.