second step on separating IOperation from BoundTree.

Add unit tests for IVariableDeclaration and IVariableDeclarationStatement

Add assemblies and packages for new code style analyzer distribution

* Getting diagnostics and location of a token without a syntax tree should not crash

* Address PR Comments

* Cleanup

* PR Comments

See Microsoft/msbuild#1661

Disable BuildWithCommandLine until #18204 is fixed

Powershell is used pretty heavily throughout our repo.  This establishes
some guidelines to approach authoring these scripts.

* Adding Unit tests for IfStatement

* Addressing PR feedback

* Addressing pr feedback

* Adding implicit embedded statement test case

Add a little bit of type-safety to editor-config storage locations.

Move stack-alloc checks out of the parser.

Don't update collection initializer statement that references collection being created

Port GoToDefinition tests

Fix accessibility issue in option page controls