Goto definition for built-in symbols in HTML script

[nknguyenhc]

Fixes #236603

I handle the filename lib.dom.d.ts and resolves it to the correct file to view definition of built-in DOM classes.

[nknguyenhc]

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[aeschli]

To compute the library location, add a new function to

vscode/extensions/html-language-features/server/src/modes/javascriptLibs.ts

Line 11 in 91e6ae9

const serverFolder = basename(__dirname) === 'dist' ? dirname(__dirname) : dirname(dirname(__dirname));

and reuse the logic there.

As for the document URI, this is trickier as this also needs to run on the web (vscode.dev), and there's no 'file' there.
You probably need to start from the extensionUri that you get on the HTML client, and pass it on the server.