Implement Optimized Attestation Selection and Aggregation Strategy

[GarmashAlex]

PR Description

This PR introduces a significant functional improvement to the block production process by implementing an optimized attestation selection and aggregation strategy. The new strategy enhances validator rewards and network efficiency by:
Intelligently aggregating attestations with the same attestation data to maximize the number of unique validators included in blocks
Prioritizing attestations based on a weighted combination of:

• Aggregation count (number of validators per attestation)
• Inclusion delay (prioritizing older attestations that are about to expire)
• Committee representation (ensuring diversity of committees)
  The implementation includes:
• A new OptimizedAttestationAggregationStrategy class that handles the core logic
• Integration with the existing BlockOperationSelectorFactory
• Comprehensive unit tests to verify the functionality
• Performance metrics logging to track improvements
  This optimization should lead to more efficient block space usage, increased validator participation, and potentially higher rewards for block proposers.

Documentation

• I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• I thought about adding a changelog entry, and added one if I deemed necessary.