refactor(gov): remove global bech32

[tac0turtle]

Description

ref #13140

this pr migrates gov to use address codec, but avoids getsigners and validatebasic. Those will be handled in a different pr

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Author Checklist

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I have...

• included the correct type prefix in the PR title
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• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
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• confirmed the correct type prefix in the PR title
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• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[julienrbrt]

lgtm