Add support for symbol-named class members

[kevinpschaaf]

Add support for symbol-named class members

[justinfagnani]

References are still tricky... we need to give guidance here on whether this should point to the export of the module (yes) so that docs can resolve it to a public API member. It's the same with other references, just bears repeating, so that this works:

input:

const foo = Symbol('foo');

export class MyElement extends HTMLElement {
  [foo]() {
    console.log('foo called');
  }
}

export foo as bar;

manifest:

{
  "path": "foo.js",
  "exports": [
    {
      "kind": "js",
      "name": "bar",
      "declaration": {
        "name": "foo"
      }
    }
  ],
  "declarations": [
    {
      "kind": "class",
      "members": [
        {
          "kind": "method",
          "nameReference": {
            "package": "my-package",
            "module": "foo.js",
            "name": "bar"
          }
}