Enable more golangci checks & remove revive

[jtraglia]

📝 Summary

• Essentially, copy .golangci.yml file from go-boost-utils.
  • By default, everything is enabled. Then we disable checks we don't like.
• Remove revive as it's run by golangci anyway.
• Copy make lint rule from go-boost-utils/mev-boost-relay.
  • This calls gofumpt with extra checks.
  • And gofmt with simplify.
• Fix findings from a few different linters:
  • Use go1.13 style errors.
  • Replace fmt.Info calls with log.Info calls.
  • Print version after the SetFormatter call.
  • Fix bug in relayMonitorList.String() that makezero identified.
  • Call t.Helper() at the beginning of helper functions.
  • Replace "POST" with http.MethodPost in http.NewRequest calls.

⛱ Motivation and Context

Just want to keep things consistent between the three projects.

I may review the disabled checks again later and try to fix some more stuff.

Fixes #306.

---

✅ I have run these commands

• make lint
• make test-race
• go mod tidy

[codecov-commenter]

Codecov Report

Merging #367 (e83af0e) into main (645d0ad) will increase coverage by 0.14%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main     #367      +/-   ##
==========================================
+ Coverage   81.38%   81.53%   +0.14%     
==========================================
  Files           5        5              
  Lines         677      677              
==========================================
+ Hits          551      552       +1     
+ Misses         97       96       -1     
  Partials       29       29              

Flag	Coverage Δ
unittests	81.53% <80.00%> (+0.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/utils.go	73.52% <50.00%> (+1.06%)	⬆️
server/mock_relay.go	86.92% <100.00%> (+0.08%)	⬆️
server/service.go	79.15% <100.00%> (ø)

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[metachris]

Great QoL improvements, thanks 🙏