feat: Add ValidateBasic() for tx messages

[lukema95]

Summary

Several module message types are missing ValidateBasic() validation. This method is crucial for performing basic stateless checks before messages reach the handler, helping to catch invalid messages early.

Problem Definition

• Improved message validation
• Catch invalid messages early
• Consistent with Cosmos SDK best practices
• Enhanced code maintainability

Proposal

Add ValidateBasic() implementation for each message type to validate:

• Required fields are not empty/zero
• Field formats are correct (e.g., valid addresses, heights, etc.)
• Basic logical constraints are met

[lukema95]

Please let me know if you'd like me to create a PR for this issue.