feat: entry point service private event support

[zeluisping]

Description

This PR integrates private event support into the EntryPointService's getUserOperationEvent method, enabling it to retrieve user operation events from private event logs.

Key Changes:

• Private Event Querying: Updated getUserOperationEvent() to query for PrivateEvent
• Event Filtering: Filters private events by eventType to only retrieve UserOperationEvent emissions
• Event Unwrapping: Unwraps private event payloads and validates the userOpHash matches the requested operation
• Search Behaviour: Checks for private events, filtering by eventType, to locate the requested user operation event
• Error Handling: Added error logging for private event unwrapping failures without breaking the flow

Implementation Details:

• Uses the centralised event ABI definitions and unwrapping utilities from utils/abi-events
• Each private log is validated, unwrapped, and checked against the target userOpHash
• Returns the first matching unwrapped event, maintaining the same return type as the public event path
• Failed unwrapping attempts are logged, but don't prevent checking remaining logs

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Removes support for public events of UserOperationEvent
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Other (please describe):

Further comments (optional)

• Removed support for the public events that were privatised; these are now handled solely as PrivateEvents