* Compare getting all refs except specific refs with seek and with filter
* Add getsRefsByPrefixWithSkips (excluding prefixes) to ReftableDatabase
* Add seekPastPrefix method to RefCursor
* UploadPack: Use reachability checker to validate non-advertised wants
* BitmappedReachabilityChecker: Reachability check using bitmaps
* BitmapCalculator: Get the reachability bitmap of a commit
* ReachabilityChecker: Default implementation with a RevWalk