Standardize logger vars and names

[kylehuntsman]

Some loggers didn't have the lassie/ prefix making it difficult to review Saturn logs and determine which logs were lassie related. I opted for the clean import of github.com/ipfs/go-log/v2 and naming our Loggers logger.

[codecov-commenter]

Codecov Report

Merging #237 (edbd7a8) into main (b1a380c) will increase coverage by 0.04%.
The diff coverage is 23.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
+ Coverage   70.89%   70.94%   +0.04%     
==========================================
  Files          68       68              
  Lines        6079     6079              
==========================================
+ Hits         4310     4313       +3     
+ Misses       1525     1523       -2     
+ Partials      244      243       -1     

Impacted Files	Coverage Δ
cmd/lassie/daemon.go	0.00% <0.00%> (ø)
cmd/lassie/fetch.go	0.00% <0.00%> (ø)
cmd/lassie/main.go	0.00% <0.00%> (ø)
cmd/lassie/version.go	0.00% <0.00%> (ø)
...g/aggregateeventrecorder/aggregateeventrecorder.go	89.20% <0.00%> (ø)
pkg/eventrecorder/eventrecorder.go	77.11% <0.00%> (ø)
pkg/eventrecorder/filelogserver/filelogserver.go	0.00% <0.00%> (ø)
pkg/indexerlookup/candidatefinder.go	65.95% <ø> (ø)
pkg/metrics/exporter.go	0.00% <ø> (ø)
pkg/metrics/server.go	0.00% <0.00%> (ø)
... and 11 more

... and 4 files with indirect coverage changes

[hannahhoward]

LGTM!

[hannahhoward]

but conflicts.

[hannahhoward]

rebased