chore: returned errors instead of panicing in auth

[chandiniv1]

Description

Issue is about returning errors instead of panicing in keeper methods in auth module and changed the keeper methods and its signatures
ref: #15555

Closes: #XXXX

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• confirmed the correct type prefix in the PR title
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[facundomedica]

tysm for this! Are you using a code formatter? Please make sure it's well configured, there are many lines that aren't formatted like return nil,err which should be return nil, err.

[github-actions]

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