com.google.android.gms.wallet is included in play-services-base

**Describe the bug**

#3507 has introduced *com.google.android.gms.wallet* classes and they were included in *play-services-base* instead of their own module - any project depending on a microG's lib now fetch these classes too.

We saw that with IzzyOnDroid analysis process on Passchain, which uses fido-core lib.

**Expected behavior**
Wallet classes should be in their own module.

Start by inspecting the changes from #3507 and the module declarations for play-services-base and the wallet classes. Confirm how the build currently packages com.google.android.gms.wallet, then verify that the wallet classes are isolated in their own module and are no longer fetched through play-services-base.

Written by the indexing model from the issue text.