tpcc: add PL/pgSQL stored-procedure mode (--stored-procs)#205
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When --stored-procs is set on `go-tpc tpcc run` (postgres driver only), each of the five TPC-C transactions is dispatched as a single server-side CALL: tpcc_new_order / tpcc_payment / tpcc_order_status / tpcc_delivery / tpcc_stock_level. Procedures are installed via CREATE OR REPLACE on the first Run() invocation (sync.Once), so the same dataset can be benched in either mode — no separate prepare step. NEW_ORDER's 1%-rollback path (sentinel item id of -1) is handled server-side via an in-band ROLLBACK inside the procedure: the engine pays for the district/orders/new_order writes and then undoes them, matching the original Go transaction's behaviour exactly. Other procedures run their work and return; the autocommit transaction commits implicitly.
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While benchmarking PostgreSQL with TPC-C, one may note that backends might spend most of the time in the ClientRead wait event. That is, PostgreSQL protocol communication spends most of the time preventing us from reaching the core bottlenecks. This PR implements --stored-procs mode (similar to HammerDB's pg_storedprocs), in which a single transaction is appended to a single stored procedure on the PostgreSQL side. This allow us to reach higher performance level and explore PostgreSQL core/storage bottlenecks with TPC-C benchmark.