pg_stat_statements: everything it can't

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Part one made the core case: pg_stat_statements counts, it doesn't record. It walked through how the queryid jumble fragments one logical query into many rows, how the first-seen text freezes your per-request tags, and how the averages bury the p99 that actually pages you. All of that was about data the extension has and distorts. This part is about the rest: the entries it silently throws…

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