[TASK] Forward initiator to typo3/html-sanitizer

A new `SanitizerInitiator` is added and forwarded to
`typo3/html-sanitizer`. This allows getting a full stack-trace
when HTML nodes have been sanitized/modified and to debug the
actual cause (initiator) much better.

To receive corresponding initiator stack-traces

* logging for TYPO3.HtmlSanitizer namespace needs to be enabled
* TypoScript `config.debug = 1` must be set, or as a fall-back
  `$GLOBALS['TYPO3_CONF_VARS']['FE']['debug'] = true;` must be set
* HTML sanitizer must have found and modified invalid tags/attributes

Resolves: #94837
Releases: master, 11.3, 10.4, 9.5
Change-Id: I0239785d347d2c4ad6153ccb26130556399949d8
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70490


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>