Emit @overload comments on generated overloads in.d.ts

[sandersn]

3 open questions:

1. Is this the right way to do it? It's similar to the way addPropertyToElementList.
2. Is it worthwhile to fix emit for multiple overloads in a single comment? That style only works without @template and with explicit @return for each signature, so I believe it's rare. I left it unfixed.
3. Is it worthwhile to fix indentation? I copied some text manipulation code from getTextOfNodeFromSourceText, but I don't want to put my new code there without evidence that it's useful for more than just my case.

Fixes #53350

[Jack-Works]

why this is needed? it already overloads with TS function signature

[sandersn]

It's not needed for types. But the jsdoc includes text that should appear in signature help—and that text is specific to each overload, so each overload needs its own jsdoc.