Add wait_event_timing: Oracle-style wait event instrumentation#1

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DmitryNFomin wants to merge 7 commits intomasterfrom

wait-event-timing

Commits on Apr 24, 2026

Add --enable-wait-event-timing compile flag and wait_event_capture GUC
DmitryNFomin
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Core wait-event-timing instrumentation: stats, trace ring, reset protocol
DmitryNFomin
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Emit QUERY_START/END and EXEC_START/END markers into the trace ring
DmitryNFomin
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Add SQL functions, views, and monitoring docs for wait_event_timing
DmitryNFomin
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Add test_wait_event_stress module for deterministic-count coverage
DmitryNFomin
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Add regression tests for wait_event_timing (strict invariants + alt output)
DmitryNFomin
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ci: enable --enable-wait-event-timing on one Linux task
DmitryNFomin
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