Refactor Sync Committee Logic and Add Unsafe Signer Verification

[kilavvy]

Description:

This pull request introduces the following changes:

1. Refactoring of Sync Committee Logic:

   • Updated the log_finality_update and log_optimistic_update functions to correctly calculate the size of the sync committee and the participation ratio. This ensures that the calculations are based on the correct sync committee size, improving the accuracy of the finality updates.

2. Addition of Unsafe Signer Verification:

   • Introduced a new field verify_unsafe_singer in the OpStackClientBuilder struct. This optional boolean field allows for the configuration of unsafe signer verification, enhancing the flexibility and security of the client builder.

These changes aim to improve the overall functionality and security of the consensus mechanism. Please review the modifications and provide feedback.

[ncitron]

These changes have already been addressed in #529 and #530