* Add new app_metrics feature available on scale and enterprise
* chore(ingestion): cache available_features for a longer period in OrganizationManager
This will come in handy for app metrics and is generally a performance win
* Add service to track app metrics
* refactor(historical-exports): Move retry limit handling code to same place as other error handling
* Track app metrics in processEvent/onEvent/exportEvents and historical exports
* Add mising app-metrics file
* Add missing __init__.py module
* Use correct topic + columns for app metrics
* Add a placeholder schema
* Set timestamp correctly
* Fix a typeerror in organization-manager.ts
* Schema fixup
* Add test showing read-own-writes logic
* Remove unneeded TODO
* Add missing constant
* Simplify flushing logic
* Stabilize VM tests
* Use correct sharding key
* Revert hooks changes