Fix errors in fontification of JavaScript import-statements (bug#61083)

Fix errors in fontification of JavaScript import-statements (bug#61083)

Currently js-ts-mode handles imports with aliases incorrectly. To be
consistent with how we otherwise do things, we should only highlight
the variable which is new and/or introduced, in this case "someAlias".

Attached is a patch which fontifies import-declarations somewhat more
correctly.

The following cases have been tested and all fontify properly:

import gnu from "fsf";              // highlights gnu
import { gnu2 } from "fsf2";        // highlights gnu2
import { gnu as gnu3 } from "fsf3"; // highlights gnu3
import * as gnu4 from "fsf4";       // highlights gnu4

* lisp/progmodes/js.el (js--treesit-font-lock-settings): Add new
import_clause rules that adhere to the comment above.