avro

AVRO-1514: Clean up Perl dependencies (#2962)

AVRO-1514: 

* Sort Perl dependencies in Github action

This minimises the chance of duplicates sneaking by.

* Drop system dependencies in Perl Github action

* Manually set Perl repository metadata

* Drop dependency on IO::String

* Add missing dependency on Test::Pod

* Mark Test::More as a test dependency

* Add Module::Install as a configure requires

* Be explicit about JSON::MaybeXS dependency

JSON::MaybeXS comes installed in the Perl container we get from
the perl setup Github action, but it's probably a good idea to
be explicit about it.