[FEATURE] Make ignoreTags configuration more flexible

This change makes the TYPO3.Flow.reflection.ignoreTags configuration
option dictionary type to allow easier adding and changing tag ignore
behavior from packages.
The change is made backwards compatible by also allowing array type
settings with additional checks.

Change-Id: Iad52330d3df511fa207e02f4643a807211cd6f31
Releases: master
Resolves: #48596