feat: sidecar RBF management

[Jiloc]

Description

Closes: #1268

This PR implements the Locktime Request Management feature to address the issue of pending requests remaining in the system indefinitely. The implementation focuses on automatically marking deposits as FAILED when they exceed their locktime without being fulfilled.

Changes

• Added RBF transaction detection and processing to the DepositProcessor service:
  • Enhanced the deposit enrichment process to check for RBF replacements for unconfirmed transactions
  • Implemented process_rbf_transactions method to identify and handle RBF'd transactions
  • Added logic to group related RBF transactions into chains using the _group_rbf_transactions helper method
  • When a transaction in an RBF chain gets confirmed, all other unconfirmed transactions in the chain are marked as FAILED
• Extended the EnrichedDepositInfo model to include rbf_txids field to track transaction replacements
• Integrated RBF processing into the main deposit update workflow

Testing Information

• Added unittest
• uv run python -m unittest

Checklist:

• I have performed a self-review of my code
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules