[TASK] Transform JavaScriptHandler.js to be hybrid IIFE and AMD

With this change JavaScriptHandler.js is not only an immediately
invoked function expression (IIFE) like before but is extended to
be used as asynchronous module definition (AMD) as well. This way
it can be used in internal TypeScript implementations as well.

Resolves: #95953
Releases: master
Change-Id: I7aa37ba707298eaa8ea151358c985a2e857cfb0c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72153


Tested-by: core-ci <typo3@b13.com>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>