Add semi-sync monitor to unblock primaries blocked on semi-sync ACKs#17763

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GuptaManan100 wants to merge 20 commits intovitessio:mainfrom planetscale:semi-sync-watcher

+1,589-30

Commits on Feb 12, 2025

feat: add the first iteration of semi-sync watcher
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Commits on Feb 13, 2025

feat: add semisync recovery sql and other missing pieces in the code
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Commits on Feb 17, 2025

Merge remote-tracking branch 'upstream/main' into semi-sync-watcher
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feat: add the capability to the monitor to keep track of outstanding writes
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feat: add the capability to run ERS to VTOrc when it detects semi-sync is blocked on the primary
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feat: added test to verify VTOrc runs an ERS when semi-sync is blocked for too long and a add a few logs
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feat: make the monitor interval configurable
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feat: add a gauge for the monitor
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feat: move the semi-sync monitor from the tabletserver to tablet manager to only start it when required
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test: poll the new gauge in the test
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feat: fix bug in isClosed function where we locked twice 🤦
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test: add comprehensive testing for the semi-sync monitor
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