Create a new generated npm workspace for typescript ANTLR generated code

[Yingyingcheng]

Context

As described in #716, we're looking for opportunities to do some client side search query validation or autocompletion, so we need to be able to get ANTLR generated code from the typescript side. This PR will unlock #717 and #718

Changes

• Updated the Makefile so that it generates TypeScript code to lib/gen/antlrv4/ts-antlrv4 along with Go code generation
• Updated the overall package.json file to include the new workspace - lib/gen/antlrv4/ts-antlrv4
• Added package.json and tsconfig.json to ts-antlrv4 so that it can later be imported into frontend code as well as get compiled.
• Updated .gitignore to exclude generated ANTLR files

Screenshot with generated typescript code:

With the changes, we should be able to import the package to frontend with:

package.json (frontend):

"dependencies": {
  "@webstatus.dev/ts-antlrv4": "file:../lib/gen/antlrv4/ts-antlrv4"
}

any ts file (frontend):

import { FeatureSearchLexer } from '@webstatus.dev/ts-antlrv4'

[jcscottiii]

FYI: I was away last week. Will be reviewing this today.

[jcscottiii]

Thanks for the contribution. Before we accept this, I have some suggestions. These suggestions should add this into our current build process to prevent it from going stale before actually using it.

[jcscottiii]

Suggested change

	"build": "tsc",
	"clean": "rimraf dist"
	"build": "tsc",
	"clean": "rm -rf dist"

We should rely on the system rm command.

[jcscottiii]

Can remove this

Suggested change

	"typescript": "^5.0.0",
	"rimraf": "^5.0.0"
	"typescript": "^5.0.0"

[jcscottiii]

Ideally, we should have a common tsconfig that both the frontend and this package extend

[jcscottiii]

We should add a new target like: build-antlr-ts

It should call the npm run build command in the lib/gen/antlrv4/ts-antlrv4 directory.

We currently have one shot commands such as make start-local and make debug-local and make precommit and make playwright-test. It will be necessary to add this target as a pre-requisite target for those.

https://github.com/GoogleChrome/webstatus.dev/blob/401f3e814e1ce0d6eebbd73d77c2bafd3a3c3f1f/DEVELOPMENT.md

https://github.com/GoogleChrome/webstatus.dev/blob/401f3e814e1ce0d6eebbd73d77c2bafd3a3c3f1f/docs/testing.md