[BUGFIX] Support MM_*  in SOLR_RELATION

Resolving MM relations ins done by hand. This prevents special
MM_* options to be used. Use the TYPO3 Core class for resolving
the relation and therefore automatically support every MM_* option
build-in at core TCA.
This is e.g. necessary for sys_category and sys_file_reference relations.

Resolves: #43968, #44966, #44967