feat: add ts files to file watchers

[rui-rayqiu]

What does this PR do?

Add ts files to LWC file system watcher so that lwc-language-server can update tsconfig.json file on core workspaces if a ts file is changed. See the related PR.

What issues does this PR fix or reference?

@W-14958700@

Functionality Before

Any LWC TS files will NOT be included in the file watcher so events won't be called if a LWC TS file is changed.

Functionality After

Any LWC TS files will be included in the file watcher so events will be called if a LWC TS file is changed.