feat(pool): allow staked senders to have multiple UOs in best_operations

[dancoombs]

Closes #251

Proposed Changes

• Simple change to allow staked accounts to have multiple UOs when calling best_operations on the pool. No changes were needed in the builder to allow for multiple UOs from the same sender in a bundle.
• Tested this by staking a sender on Arb Sepolia and sending 10 UOs (bundler in manual mode to force them all into a single bundle). Transaction here.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 54.13%. Comparing base (b39116b) to head (c8f0678).

Additional details and impacted files

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[dancoombs]

Closing in favor of https://github.com/alchemyplatform/rundler/pull/732