[FEATURE] Introduce PSR-14 BeforeTcaOverridesEvent

This event can be used to dynamically generate TCA and add it as
additional base TCA. This is especially useful for "TCA generator"
extensions, which add TCA based on another resource, while still
enabling users to override TCA via TCA overrides as usual.

Resolves: #102067
Releases: main
Change-Id: I6d96e18b94f2a53693037b46e3b23d3b7f657154
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81297


Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>