Testing suite for builder

[bertmiller]

Rationale

To allow anyone to easily make changes to the builder, measure their impact, and ensure that they are safe.

Implementation

• Provide standardized tools and data (sample bundles)for testing
• Provide a framework for testing (e.g. performance metrics)
• Create guide to deploying and testing the builder

One way to approach this is to create a mass conflicting bundles at random and test merging against those. But thinking it through we might want a standardized dataset that allows for more precise measurement of performance (e.g. variance in the randomized generation of bundles doesn't affect performance)

[bertmiller]

I was thinking we need these things:

• provide a guide to setting up the builder for local development
• provide a test script to run
• provide testing data (bundles and txs)

the output should be something like:

• hey, the code all works as intended and these X number of checks were met!
• XX bundles were merged
• XX bundles were simulated
• in XX time XX block templates were generated
• the most profitable block was XY ETH with XX bundles merged alongside XX transactions

ideally this is somehow standardized with the same inputs so that you can directly compare 2 versions of the code and say "hey, this version performed better than the other, which performs better than the main branch"