CloudWatch: replace full query parser with regex scanner that extracts stats groups (#32610)

package.json

@@ -219,7 +219,6 @@
     "@sentry/browser": "5.25.0",
     "@sentry/types": "5.24.2",
     "@sentry/utils": "5.24.2",
-    "@types/antlr4": "^4.7.1",
     "@types/braintree__sanitize-url": "4.0.0",
     "@types/common-tags": "^1.8.0",
     "@types/hoist-non-react-statics": "3.3.1",
@@ -235,7 +234,6 @@
     "angular-bindonce": "0.3.1",
     "angular-route": "1.8.2",
     "angular-sanitize": "1.8.2",
-    "antlr4": "^4.8.0",
     "baron": "3.0.3",
     "brace": "0.11.1",
     "calculate-size": "1.1.1",