feat(SvmSpokePoolClient): relayFillStatus and fillStatusArray implementation

[melisaguevara]

This PR introduces the SVM implementation for relayFillStatus, which reconstructs the fill status of a given relay based on historical events up to a specific block.

The steps to reconstruct fill status are:

1. Retrieve the fill status PDA associated with the target relay.
2. Query all relevant events (fills and slow fill requests) from that PDA, up to the specified block.
3. Sort the events in ascending order by slot number.
4. Determine the current fill status based on the most recent event:
   • If no events are found, the status is considered Unfilled.
   • Otherwise, the status reflects the type of the latest event.

It also introduces the implementation for fillStatusArray, which batch calls to relayFillStatus in groups of 200 deposits.

[linear]

ACX-4029 implement relayFillStatus