Enable regex filtering of schemas per security group

[spetar]

It is really usable to enable schema filtering per security group.
Currently product enables filtering of every object (topic, consumer group, connector) except schema.

khq.security.groups: Groups map definition
I suggest to add functionality and extend configuration like this:
attributes.schema-filter-regexp: Regexp list to filter schemas by subject available to security group

in the same manner as it's done for other objects:
attributes.topics-filter-regexp: Regexp list to filter topics available for current group
attributes.connects-filter-regexp: Regexp list to filter Connect tasks available for current group
attributes.consumer-groups-filter-regexp: Regexp list to filter Consumer Groups available for current group

[tchiotludo]

PR are welcome on that 👍 (mostly the same than this one 371186c)

[n-i-c-o-l-a-s]

Hello. A regexp to filter schemas would be very useful.

[tchiotludo]

done in #1472