Backport Regex usage of denom validation

[mattverse]

Description

Closes: #XXXX

Backport Regex usage removal upstream

Author Checklist

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I have...

• [ ] included the correct type prefix in the PR title
• [ ] added ! to the type prefix if API or client breaking change
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• [ ] provided a link to the relevant issue or specification
• [ ] 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
• [ ] reviewed "Files changed" and left comments if necessary
• [ ] confirmed all CI checks have passed

Reviewers Checklist

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• [ ] confirmed the correct type prefix in the PR title
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• [ ] manually tested (if applicable)

Summary by CodeRabbit

• New Features
  • Enhanced denomination validation in the system to include checks for valid characters and format.
• Tests
  • Introduced new tests to ensure the reliability of denomination validation with a variety of cases.

[coderabbitai[bot]]

Walkthrough

The recent changes enhance the validation of denomination strings in a financial application. By incorporating the "unicode" package, the code now ensures that denomination strings consist only of valid runes, improving the robustness and security of currency handling. A new test function supports these changes by rigorously checking denominations against a variety of cases, ensuring the system's reliability in processing financial transactions.

Changes

File(s)	Summary
types/coin.go	Introduced "unicode" import, added isValidRune and MatchDenom for improved denom validation.
types/coin_test.go	Added TestValidateDenom to validate denomination formats with diverse test cases.

🐇 In the code's burrow, deep and wide,
A rabbit worked with joy and pride.
With runes and tests, it danced and hopped,
Ensuring no bad coin was dropped.
🌟 "To validate!" was its merry song,
As it made the codebase strong.
🎉 Let's celebrate, for through the night,
Our rabbit's code does shine so bright.

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