convert `Timeline::layers` to async RwLock atop #4321#4360

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problame wants to merge 49 commits intomainfrom problame/async-timeline-get/timeline-layers-tokio-sync-atop-4321

+729-438

Commits on May 23, 2023

Commits on May 24, 2023

Commits on May 25, 2023

Commits on May 26, 2023

improve TenantState doc comments, repeating what's in the Mermaid diagram
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log while waiting for tenant to finish activation
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set_stopping(): report in result if not transitioning to Stopping
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don't hold TENANTS lock while waiting for set_stopping()
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Merge remote-tracking branch 'origin/main' into problame/async-timeline-get/dont-hold-timelines-lock-inside-tenant-state-send-modify
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demote warn line to info-level, as the log line in set_stopping() is also info!()
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timeline_init_and_sync: don't hold Tenant::timelines while load_layer_map
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move load_layer_map to before initialize_with_lock outside of Tenant::timelines held code
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controversial but necessary: keep holding layer map lock inside compact_level0_phase1
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basebackup import: pre-lock the layer map for the flush() calls
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(does not compile): make TimelineWriter Send by using tokio::sync Mutex internally
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turn Timeline::layers into tokio::sync::RwLock
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