Implement dynamic field cleanup mechanism on uninstall

[stefanhaerter]

See FAQ packagesetup for reference:

https://github.com/RotherOSS/FAQ/blob/92978836e9a9840b127d50de38901ab4e227f239/var/packagesetup/FAQ.pm#L693-L699

Putting this issue in the OTOBO Issues project for planning.

[svenoe]

Please implement as generic method to delete all dynamic fields of a certain object type and merge the non service catalog specific part into OTOBO 11.1.