- Lifted `DefaultEditorSettingsManagerInternal`s state / event handling functionality into its `DefaultEditorSettingsManager`.
- Re-purposed `EditorSettingsManagerInternal` into a less-API heavy middleman `WorkspaceEditorSettings` for any workspace services concerned with editor settings to consume.
- Moved `DefaultEditorSettingsManagerInternal` into the Editor.Razor assembly and renamed it to `DefaultWorkspaceEditorSettings` since it needed the `EditorSettingsManager` API to function properly. The contract still exists at the `CodeAnalysis.Razor.Workspace` level.
#1982
