Move VS lsp client implementation to EditorFeatures for VSMac

[dibarbet]

This PR does a few things

1. Moves the ILanguageClient implementation down to EditorFeatures
2. Removes the VisualStudioWorkspace import from ILanguageClient implementations in favor of a service that retrieves the HostWorkspaceServices (allows VSMac to provide their own set). Resolved by More options refactoring #56089 to use the global options service in all cases where we previously accessed the workspace.
3. To resolve a circular dependency where the LSP layer depends on Editor features (for things like VS icons, inline rename, etc, see Remove dependency on Editor and EditorFeatures from Microsoft.CodeAnalysis.LanguageServer.Protocol project #55142), I moved any LSP handler implementation that required EditorFeatures into the EditorFeatures project itself. This makes the LSP layer totally clean and clearly indicates which handlers need to be fixed and moved to the LSP project.

TODO verify on helix

[tmat]

internal interface IDiagnosticModeService : IWorkspaceService

I'm deleting dependency on workspace here #56052

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Refers to: src/Features/Core/Portable/Diagnostics/IDiagnosticModeService.cs:14 in 85406c0. [](commit_id = 85406c0, deletion_comment = False)

[jasonmalinowski]

but a few requests for TODO comments or equivalent. There's also some types that got moved to EditorFeatures that still have "VisualStudio" prefixes for no clear reason and can probably be renamed.