* feat(repository): ensure we don't run parallel fetches for the same blob IDs
Fixed a bunch of test flakes.
* fixed race condition, limit the size of mutex cache by using LRU
This is done by protecting newly added cache items from being swept for
X amount of time where X defaults to:
* `metadata` - 24 hours (new)
* `data` - 10 min (new)
* `indexes` - 1 hours (same as today)
Fixes#1540
* cache: refactored reusable portion of cache into separate package
* repo: plumbed through caching for remote repository clients
* repo: plumb through cache in the unit tests
* cache: ensure we only allow absolute cache paths, fixed cache path resolution for remote repositories
