[pool/builder] Unsafe mode

[dancoombs]

Describe the feature
Add a flag to toggle unsafe mode on for the pool and builder. This will skip simulation (and any associated debug_traceCall) in both the pool and the builder. The pool will fill out PoolOperation with empty values as the builder won't read them. Conditional transactions will be submitted with empty lists.

This is useful for local testing on hardhat/anvil nodes as well as for running a local bundler on testnets via remote RPCs.