Add support for Bitcoin deposits

[MakMuftic]

Expand SDK to support creating Sygma-compatible deposit transactions on the Bitcoin network. Any additional scope will additionally be determined based on first integration requirements.

Implementation details

• TBD (based on the scope required for first integration)

Testing details

• Add basic unit tests
• Manually try to create a Bitcoin deposit on the testnet

QA Details

• TBD (based on the scope required for first integration)

Acceptance Criteria

• [ ] Scenario: Add support for Bitcoin deposits
  • Given the SDK currently does not support Bitcoin deposits
  • When the implementation is completed
  • Then the SDK should support creating Sygma-compatible deposit transactions on the Bitcoin network
• [ ] Scenario: Implementation details
  • Given the scope of the implementation is not yet defined
  • When the scope is determined based on first integration requirements
  • Then the implementation details should be updated accordingly