feat: Verify transfer addresses in Observer (backport #7943)

[mergify]

Epic: #7643

What is the purpose of the change

• Add destination address verification for x/bridge observer

Testing and Verifying

• Unit tests

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes?
• Changelog entry added to Unreleased section of CHANGELOG.md?

Where is the change documented?

• Specification (x/{module}/README.md)
• Osmosis documentation site
• Code comments?
• N/A

Summary by CodeRabbit

• New Features

  • Enhanced Bitcoin observer functionality for improved error messaging and transaction relevance logic.
  • Introduced new features to Osmosis observer including mode settings and better error handling.

• Bug Fixes

  • Fixed Bitcoin address validation in memo retrieval.
  • Improved test scenarios for both Bitcoin and Osmosis observers to cover various transaction types and scenarios.

• Refactor

  • Streamlined Bitcoin and Osmosis observers' code for better maintainability and performance.

---

This is an automatic backport of pull request #7943 done by [Mergify](https://mergify.com).