fix(cmd): handle errors and improve output formatting

* update error handling in various commands to use blank identifier
* enhance output formatting for better readability
* add golangci-lint to Makefile for linting checks

pkg/format/keywords.go

@@ -68,6 +68,6 @@ to_char to_date to_json to_jsonb to_number to_timestamp to_tsvector
 translate trim trunc unnest upper width_bucket
 `)
 
-func isKeyword(lower string) bool       { return keywords[lower] }
-func isTypeName(lower string) bool      { return typeNames[lower] }
-func isBuiltinFunc(lower string) bool   { return builtinFunctions[lower] }
+func isKeyword(lower string) bool     { return keywords[lower] }
+func isTypeName(lower string) bool    { return typeNames[lower] }
+func isBuiltinFunc(lower string) bool { return builtinFunctions[lower] }