Full-history benchmark commands — ingest across all data types #771

TL;DR

The single home for full-history ingestion benchmark commands: ingest benchmarks across ledgers, events, and txhash, on both hot and cold tiers. Built by rewiring the rpc-hack bench prototypes onto the production ingesters from #765, with a CSV metrics sink. Subsumes #730's ingest half.

Re-scoped to ingestion only; the query benchmarks are split out to #856.

Scope

• Benchmark commands for ingest, per data type (ledger / events / txhash), hot and cold tiers.
• Run against Ingestion: all data types for both cold and hot stores #765's production ingesters (CSV metrics sink), not the rpc-hack prototype's own ingest path.
• XDR-views only — drop the views-vs-struct-decode comparison the rpc-hack prototype carried; views is the committed path.
• Land on feature/full-history at mergeable quality.

Source

rpc-hack scripts/bench-fullhistory/ (~31 files) — the prototype to rewire.

Dependencies

• Production ingesters from Ingestion: all data types for both cold and hot stores #765.