Refactor out radicle::Logger and radicle::logger::Logger to radicle-log crate.

Enhance the test logger to highlight:

1. Any base58 strings with a deterministic colour
2. Any git refs to be boldened and underlined a. Any base58 strings inside refs to adhere to 1.
3. Any git OIDs (short and long) first 6 characters mapped to a hex colour with light and dark background adjustments
4. ... any timestamps also coloured as per 3. 👀
5. error level logs are all red and underlined (with rules 1 - 4 applied)
6. warning level logs are all yellow and underlined (witith rules 1 - 4 applied)

I /think/ I managed to preserve the existing feature toggles, but worth double checking!