This fixes error logs like
RR error when calling Createhome error="gateway: grpc failed with code CODE_INVALID_ARGUMENT" line=github.com/opencloud-eu/opencloud/services/proxy/pkg/middleware/create_home.go:87 service=proxy
e.g. during internal requests to the data provider.
* enhancement: add graph beta listPermissions endpoint
besides the new api endpoint it includes several utilities to simplify the graph api development.
* resolve drive and item id from the request path
* generic pointer and value utilities
* space root detection
* update GetDriveAndItemIDParam signature to return a error
* move errorcode package
* enhancement: add generic error code handling
* fix: rebase
* enhancement: use reva client pool selectors
register mock service to registry and pass tests
* enhancement: bump reva
* Fix a couple of linter issues
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Co-authored-by: Ralf Haferkamp <rhaferkamp@owncloud.com>
