feat: remove recovery module

[tkkwon1998]

Description

This pull request removes the x/recovery module from canto. This module is no longer used after issues regarding different key types were solved.

App.go is prepped for easy merging of x/onboarding (#103).

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[tkkwon1998]

@poorphd can you review this PR?

[poorphd]

Everything LGTM. I will update onboarding PR once this gets merged.