Add gocritic linter (#1324)

* Add gocritic linter

`gocritic` provides diagnostics that check for bugs, performance, and style issues

We disable the following checks:

- commentFormatting
- captLocal
- deprecatedComment

This PR contains many `//nolint:gocritic` to disable `appendAssign`.

util/retry.go

@@ -15,7 +15,7 @@ func Retry(attempts int, sleep time.Duration, toExec func() error, onError func(
 
 		if attempts--; attempts > 0 {
 			jitter := time.Duration(rand.Int63n(int64(sleep)))
-			sleep = sleep + jitter/2
+			sleep += jitter / 2
 
 			onError(err)
 			time.Sleep(sleep)