Add more validation to parser + fmt improvements

Added

• parser: validation for builtin keyword usages & more (#1338)
• parser: validation for json_array/json_object, fmt quoting fixes (#1337)
• parser: validation for empty lists & related (#1336)
• parser: validation for extra commas/func args/only/graph table (#1335)

Changed

• parser: refactor named arg to not be a general expr (#1332)

Fixed

• fmt: fix identing for select clauses (#1339)
• fmt: fix quoted func names (#1334)
• fmt: fix more cases where we drop comments (#1333)
• fmt: adjust values rows & fix keyword quoting (#1330)