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* Make PS connection startup use async APIs This allows for improved query cancellation when we start connections * Make PS connections have per-shard connection retry state. Previously they shared global backoff state, which is bad for quickly getting all connections started and/or back online. * Make sure we clean up most connection state on failed connections. Previously, we could technically leak some resources that we'd otherwise clean up. Now, the resources are correctly cleaned up. * pagestore_smgr.c now PANICs on unexpected response message types. Unexpected responses are likely a symptom of having a desynchronized view of the connection state. As a desynchronized connection state can cause corruption, we PANIC, as we don't know what data may have been written to buffers: the only solution is to fail fast & hope we didn't write wrong data. * Catch errors in sync pagestream request handling. Previously, if a query was cancelled after a message was sent to the pageserver, but before the data was received, the backend could forget that it sent the synchronous request, and let others deal with the repercussions. This could then lead to incorrect responses, or errors such as "unexpected response from page server with tag 0x68"