refactor: provide AppState.waitForSchemaCacheLoaded function#4709
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This commit replaces ioRef based implementation of schema cache status tracking to MVar based, so that it is possible to wait for schema cache loading. Waiting for schema cache loading is necessary to implement zero-downtime upgrades with SO_REUSEPORT, where listening on a socket must wait for schema cache loading.
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This commit was authored entirely by a human without the assistance of LLMs.
This commit replaces ioRef based implementation of schema cache status tracking to MVar based, so that it is possible to wait for schema cache loading.
Waiting for schema cache loading is necessary to implement zero-downtime upgrades with SO_REUSEPORT, where listening on a socket must wait for schema cache loading.
Prerequisite of #4703