Cleaning it and moving the breaking "test" code to testutils
Related to: https://github.com/cosmos/cosmos-sdk/pull/10956
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## Description
Closes: #10082
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### Author Checklist
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- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [x] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed
### Reviewers Checklist
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I have...
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* support multisig bech32 address parsing
* Increase bech32 length limit to 250
* Increase max bech32 address size to 1023 (the max length that supports the checksum)
* Update go.mod
* Update go.mod to point to the updated enigmampc/btcutil
Robert Zaremba
Jeeyong Um
Assaf Morami
Marko