Fix various concurrency and tracing issues

[BrianBland]

This changeset fixes a variety of concurrency edge cases and race conditions, which are more pronounced during heavyweight benchmarking such as when opcode tracing is enabled.

• Wait up to 2 hours, in 10 second increments, for the engine API to finish syncing before executing the benchmarks. This appears to be necessary for certain Reth configurations, as the engine may perform some sync-related operations on startup.
• Lock around calls to RecordBlockStats
• Only stop processing blocks/stats after all stats have been recorded
• Refactor the opcode tracing to improve handling of static calls and gas refunds