Investigate broader support for WorkspaceFolder in the API (glob, doc filter) #34157
Description
Find out in which APIs we should provide WorkspaceFolder support.
One idea is to look for APIs that today accept a glob pattern and enrich it with a type that allows to specify a workspace-folder-relative pattern.
Candidates:
DocumentFilter(Introduce IRelativePattern and adopt in DocumentFilter/FileWatcher/FileSearch #34695)workspace.findFiles(https://github.com/Microsoft/vscode/tree/ben/34157-findfiles)workspace.createFileSystemWatcher(https://github.com/Microsoft/vscode/tree/ben/34157-filewatcher)