[Feature]: Create reject-withdrawal-request transactions

[djordon]

Feature - Create reject-withdrawal-request transactions

1. Description

The signer coordinator needs to put together stacks transactions for finalizing a withdrawal by creating an reject-withdrawal transaction. This ticket is for generating the stacks transaction that can pass validation by other signers.

1.1 Context & Purpose

We need to actually generate the stacks transaction before we could submit it for other signers to sign. Unfortunately, we do not have the code for validating the reject-withdrawal-request contract call.

2. Technical Details:

2.1 Acceptance Criteria:

• We have the code that creates a reject-withdrawal-request smart contract call object (the RejectWithdrawalV1 struct) for withdrawals that won't be swept out.

3. Related Issues and Pull Requests (optional):

• [Feature]: Validate reject-withdrawal-request contract calls #478
• [Feature]: Create complete-deposit transactions #563
• [Feature]: Create accept-withdrawal transactions #564