Runes executor

[mpetrun5]

Implement message handler and executor to handle sending Rune tokens to the Bitcoin
destination address.

Implementation details

• Refactor executor so it creates a transaction depending on resource type
• Implement message handler that differentiates between native token and rune token and creates a valid proposal
• Implement bitcoin transaction implementation that encodes a Rune transfer

Testing details

• unit tests

Acceptance Criteria

• we are able to transfer Rune token to a Bitcoin address