feat(pg): add abortable query cancellation - #3751
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Use a dedicated cancellation connection and hold each client queue until both the target reaches ReadyForQuery and cancel transport closes. This prevents a late cancellation from hitting following work. Support AbortSignal and cancelQuery across JavaScript and native clients. Fail closed when active signal cancellation becomes uncertain, and document race, pool, transaction, TLS, and pipeline semantics. Refs brianc#2774
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Use a dedicated cancellation connection and hold each client queue until both the target reaches ReadyForQuery and cancel transport closes.
Refs #2774