[Feature]: Add support for constructing withdrawal reject sBTC transactions

[djordon]

Feature - Add support for constructing withdrawal reject sBTC transactions

1. Description

1.1 Context & Purpose

If the signers agree to reject the withdrawal request, the need to make a contract call noting this fact. This ticket is for adding support for constructing the sBTC reject-withdrawal stacks transaction.

2. Technical Details:

2.1 Acceptance Criteria:

• Given the sBTC contract address and the reject-withdrawl function interface, add support for making a properly formatted request to a stacks node for the contract call. The transaction does not need to contain a valid signature.

This ticket only relates to the "reject-withdrawal" contract call, which relates to #97.

3. Related Issues and Pull Requests (optional):

This is a sister issue to #230 and #231.