* API: Allow to use the file watcher for aribitrary folders (#3025)
* fix tests
* update `createFileSystemWatcher` docs
* refuse to watch resources that are watched in workspace already
* properly check proposed API
* make it work via `createFileSystemWacher` (first cut)
* more docs
* cleanup
* enable recursive watching based on pattern
* add tests
* drop out-of-workspace events when using simple patterns
* do not apply excludes when watchig files
* log extension watch requests
* also log unwatch
* improved exclude handling
* more docs
* drop proposed api needs
* remove `suite.only`
* cannot watch inside workspace more than once
* do not send extension decriptor over
* adopt latest changes
* add `baseUri` to relative pattern
* backwards compat
