This reverts commit 4a3dbb6c.

This reverts commit 7cb8ac43.

* 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

workspace.openTextDocument works incorectly when passing { content?: string; } as argument (fix #34796)

add id to FileStat and remove resource, make readdir return tuples, sketch up error codes, add todos on the API