Adds unit testing (just for the trie for now)

Cleans up overloads

Avoids debouncing repo change events
Allows for immediate resetting up data, but still debounces updates
Also avoids a repo change event clearing valuable data after the fact

Remembers & attempts restore of last known git path (per workspace)
Races a git path search while getting the path from SCM

Renames content method for clarity

Should help with eventual testing

Consolidates to node-fetch 2.6.7 as Octokit requires v2

- Adds proper error handling & messaging
  - Handles uncommitted lines
Adds open prior blame to hover on uncommitted lines

Avoids saving/re-saving object if it isn't changing

Avoids re-export from git provider service

Abstracts node path imports to system/path

Adds more docs
Removes unused original file name from diff calls

Avoids default params to reduce garbage

For virtual workspaces. Will be continually converting strings to Uris