Delete a bunch of code on Roslyn side, which is no longer necessary as we don't own the column anymore.
I have also cleanup up some code in this space for newly added ContainingType and ContainingMember columns.

Changes based on review by Cyrus Najmabadi, + IgnoreCase in VisualBasicAddImportsService.MakeSafeToAddNamespaces

Add AnalyzerConfigDocument APIs parallel to the existing AdditionalDocument APIs in the Workspaces layer.

Also added relevant unit tests

This is a reworked version of #32616 targeting the dev16.0-preview3 branch.

* wip

* FIx for 18409

* Additional fix

* remove commented out code
Co-Authored-By: Nchborl <chborl@users.noreply.github.com>

* Fix spacing issue
Co-Authored-By: Nchborl <chborl@users.noreply.github.com>

* Use default instead of 0
Co-Authored-By: Nchborl <chborl@users.noreply.github.com>

* Respond to feedback

* Add test

this is so that we don't get this kind of issue (https://github.com/dotnet/roslyn/issues/31928) by throwing argument exception invalid argument is given

This reverts commit c016937c, reversing
changes made to 363f479c.

This ports https://github.com/dotnet/roslyn/pull/28472, that went into the `editorconfig-ide` feature branch, into `dev16.0.x` branch with following additional refactorings/enhancements:

1. Generated .editorconfig file has all localized string as comments.
2. No hardcoding of individual options in the editorconfig file generator. Instead, each `EditorConfigStorageLocation` now requires to provide a delegate to convert a given option value into the .editorconfig string representation (basically complimentary of the parsing delegate that was already required).
3. Introduce concept of `OptionGroup` to enable grouping options in the same feature (such as CodeStyleOptions, CSharpCodeStyleOptions, FormattingOptions, CSharpFormattingOptions, etc.) into sub-features or groups (such as "this. preferences", "expression-level preferences", etc.). This enables the editorconfig generation to group the related options, without explicit knowledge of each option group.
4. Expose `AllOptions` from each option feature (such as CodeStyleOptions, CSharpCodeStyleOptions, FormattingOptions, CSharpFormattingOptions, etc.), so that the corresponding `IOptionProvider` always stays in sync with implemented options.