Drop client packages for Apollo Kotlin v3

[smyrick]

As part of the updates in Apollo Kotlin v3, a lot of the features requested on our backlog are now supported there.

Do we want to keep maintaining a separate client module that does most of the same features? Somethings missing is the direct support for a Maven plugin version. There are some community versions but maybe that we could create a new one that supports v3 in a separate repo.

This is just an open discussion, so feel free to shoot me down, but I am just considering what would be the value of now spending time to maintain a different client package, instead of consolidating on a single one for the community.