Add jsdoc support to js-ts-mode

Add jsdoc support to js-ts-mode

* lisp/progmodes/js.el (js--treesit-font-lock-settings): Add jsdoc
font-lock settings.
(js--treesit-jsdoc-beginning-regexp): New variable to match the
beginning of a jsdoc block.
(js-ts-mode): Add jsdoc support. Save the 'javascript parser to
`treesit-primary-parser'. Configure `treesit-range-settings' to
use a jsdoc parser within a JavaScript file.
(js-ts-language-at-point): New function to return either 'jsdoc or
'javascript depending on where the point is.