Less namespace polution by moving meat of implementation to local module.
Less namespace polution by moving meat of implementation to local module.

Related to https://github.com/orta/cocoapods-keys/pull/31#commitcomment-9562540

colinta/cocoapods-keys,kazuph/cocoapods-keys,alloy/cocoapods-keys,ashfurrow/cocoapods-keys,orta/cocoapods-keys,anurlybayev/cocoapods-keys,colinta/cocoapods-keys,ashfurrow/cocoapods-keys,anurlybayev/cocoapods-keys,AutoScout24/cocoapods-keys,alloy/cocoapods-keys,kazuph/cocoapods-keys,orta/cocoapods-keys,AutoScout24/cocoapods-keys