Testing suite for builder about builder HOT 1 OPEN

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"

from builder.