Add providers for consolidation and deposit requests.

[ahmohamed]

This PR adds support for retrieving consolidation and deposit requests from the chain database.

1 .PostgreSQL Implementation:

• Added ConsolidationRequests method to retrieve consolidation requests based on filters
• Added DepositRequests method to retrieve deposit requests based on filters
• Added ConsolidationRequestFilter with support for filtering by slot range, source/target pubkeys, and block roots
• Added DepositRequestFilter with support for filtering by slot range, validator pubkeys, and block roots

2. Mock Service Updates: Added mock implementations for all new methods to maintain interface compatibility.

[Bez625]

Thanks @mcdee !