* op-dispute-mon: Enrich games in parallel

Reports any failure to retrieve data in the failed metric since it results in the game being skipped.

* op-dispute-mon: Make max concurrency configurable

Simplify the code a bit.

* op-dispute-mon: Add numbers to log

* op-dispute-mon: Reduce default max concurrency

* op-dispute-mon: Add metric for monitor duration

* op-dispute-mon: Fetch output root agreement in extract stage

Removes the last HTTP call from the transform stage and allows the calls to be done in parallel.