This ticket represents the culmination of the first milestone. This ticket will integrate the pieces that we're previously implemented together.

• Consult feature flag in run_aggregate and branch into the new join reordering module
• Ensure we are in situation where join reordering applies (no sharded collections, all collection co-located, etc.)
• Attempt to extract join graph. Fallback to existing code upon failure.
• Invoke single table access path selection for each referenced collection
• Construct single physical plan (QuerySolution) with a pseudo random traversal of the join graph.
• Invoke stage builders to construct SBE executable plan
• Attach suffix DocumentSources that were not pushed down