Move bundle merger

[ZanCorDX]

📝 Summary

For historical reasons, bundle merging logic (MultiShareBundleMerger) had to be implemented on each algorithm but that's not needed anymore so I removed MultiShareBundleMerger from both algorithms and added it in a single point between simulation and block building.

💡 Motivation and Context

• The way it was before made implementing new algorithms more difficult.
• Removed redundant calculations.

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✅ I have completed the following steps:

• Run make lint
• Run make test
• Added tests (if applicable)

[github-actions]

Benchmark results for 24044d6

Report: https://flashbots-rbuilder-ci-stats.s3.us-east-2.amazonaws.com/benchmark/24044d6-8989fca/report/index.html

Date (UTC)	2024-12-18T21:44:41+00:00
Commit	24044d643bf8e7101ee187b5f6496e887545f0d2
Base SHA	8989fca4e065fee013fd3d4aec225e4847cc3028

Significant changes

Benchmark	Mean	Status
hashing_3000_elements	-4.32%	Performance has improved.