* feat: add `upgrade` command in the cmd directory

this is a wrapper around the main implementation and it plugs-in with
the cobra command.

* feat: add a pkg to support `datree upgrade` command

In this pkg we are going to write all types of helper and nested utils
methods that can be used to support the upgrade process

* feat: add `upgrade` command in the main cobra command file

* fix lint error - imports

* remove `upgrade` method from cmd file

* fix lint errors

* revert lint fix - unrelated files

* working `upgrade` command

* print success message after upgrade

* refactor: `CheckIfDatreeInstalledUsingBrew` datree

* fix: return if error encountered

* add newline and fix lint errors

* assign `runtime.GOARCH` directly to arch variable

* refactor: remove golang logic and implement fetching shell script and executing it

* Use camelCase convention - variable name
Co-authored-by: shalev007 <51760613+shalev007@users.noreply.github.com>

* use camelCase `errMsg`

* fix spelling mistake
Co-authored-by: Roy Hadad <39004075+royhadad@users.noreply.github.com>

* change script URL to `https://get.datree.io`



* resolve conflicts

* rewrite `upgrade logic` - make it simpler

* refactor: remove extra code and write one-liner command

* remove duplicate code

* add check for windows OS

* fix check for windows OS

* fix: print out stderr as well
Co-authored-by: shalev007 <51760613+shalev007@users.noreply.github.com>
Co-authored-by: Roy Hadad <39004075+royhadad@users.noreply.github.com>
Co-authored-by: Roy Hadad <roy@datree.io>