* Add CodeAction Type

Adds skeleton on a new CodeActionType and allows codeActionProvider to return either `Command`s or `CodeAction`s

Move proposed CodeAction API to proposed and try using it in TS

Split CodeAction into quickfix and refactoring classes

Update proposed interface

Update for new API

Adding basic docs

* Support workspace edits and text edits in codeactions

* Remove placeholders

* Resolving conflicts and making PR suggested changes

* Fix quick fix test

* Revert change to only use `CodeAction` instead of `CodeAction | Command` in modes since this will break `vscode.executeCodeActionProvider`

* Provide additional workspace API to add/remove workspace folders (for #35407)

* add/removeFolders => add/removeFolder

* make add/remove folder return a boolean

* use proper service for workspace editing

* workspac => workspace

* do not log promise canceled messages

* show confirm dialog

deco - use correct/overwrite decorations in scm viewlet because the same URI can have multiple decorations

* introduce IRelativePattern and use in extension API

* 💄

* docs

* introduce RelativePattern

* support RelativePattern also for file watcher

* also make findFiles support RelativePattern

* less type conversion

* add GlobPattern type and remove readonly

* make base a string

* fix setter access to RelativePattern

* fix npe when exclude is undefined

* fix findFiles: pattern seems to be matched against workspace always

* 💄

* clarify glob pattern matching