Import go-log directly (except in GPBFT) and remove Logging

[Stebalien]

It was causing circular import issues (which could have been fixed by moving it, I guess) but, more importantly, the abstraction really wasn't pulling its weight. We're keeping it out of GPBFT itself but our other packages already depend on things like go-datastore and go-libp2p, so depending on go-log doesn't really matter.

[codecov]

Codecov Report

Attention: Patch coverage is 40.54054% with 22 lines in your changes missing coverage. Please review.

Project coverage is 74.36%. Comparing base (8df83eb) to head (2d43052).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #427      +/-   ##
==========================================
- Coverage   74.77%   74.36%   -0.42%     
==========================================
  Files          41       42       +1     
  Lines        3719     3713       -6     
==========================================
- Hits         2781     2761      -20     
- Misses        657      665       +8     
- Partials      281      287       +6     

Files	Coverage Δ
logging.go	100.00% <100.00%> (ø)
certexchange/polling/subscriber.go	78.88% <75.00%> (ø)
cmd/f3/run.go	0.00% <0.00%> (ø)
f3.go	70.46% <50.00%> (-3.54%)	⬇️
certexchange/client.go	66.66% <33.33%> (+1.51%)	⬆️
certexchange/server.go	59.01% <0.00%> (-9.84%)	⬇️
host.go	62.08% <42.85%> (-3.31%)	⬇️

... and 2 files with indirect coverage changes