v2: Project-and-CI-wide linter config (#2812)

* v2: split golangci-lint configuration into its own file to allow code editors to take advantage of it

* v2: simplify code

* v2: set the correct lint output formatting

* v2: invert the logic of linter's configuration of output formatting to allow the editor  convenience over CI-specific customization. Customize the output format in CI by passing the flag.

* v2: remove irrelevant golangci-lint config

caddyconfig/caddyfile/lexer.go

@@ -107,7 +107,6 @@ func (l *lexer) next() bool {
 				escaped = false
 			} else {
 				if ch == '"' {
-					quoted = false
 					return makeToken()
 				}
 			}