Switch between case sensitive and case insensitive search via parameter

[klingerko]

If would be great to make case sensitive and case insensitive queries on the fields.
-> would be great to have all results of a 0x20 bit decoding in dns in one result

[magenbluten]

current database design does not allow for case insensitive searches. we should check rocksdb docs if it is possible to do something like case-insensitive key iteration. we could convert all characters to lower (or upper) case but since that would be a change of the raw observed data i think this is not a good idea.