Decouple auth module from other SDK top-level core packages

[robert-zaremba]

Summary

Related to

• Decouple auth module from other SDK top-level core packages #4488 (this work was started there).
• Move client/tx/legacy_test.go to x/auth #7359 Move client/tx/legacy_test.go to x/auth
• Remove bech32 PubKey support #7447 Remove bech32 PubKey support
• Refactor x/auth cli tests and add docs #8711 Refactor cli tx commands
• x/auth & x/bank Improvements #7091 x/auth & x/bank Improvements

We still some modules doing cross imports.
Example: packages from x/auth are imported in client/tx and in x/bank/.

/cc @alessio

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[clevinson]

Ideally some of this can be tackled more broadly when looking at #7091

[robert-zaremba]

Ideally some of this can be tackled more broadly when looking at #7091

Thanks, I've mentioned this in the issue OP.

[tac0turtle]

this is part of app wiring work.