feat: Add penalty to channel selection for fast server errors #2674
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This change modifies the channel selection logic in BigtableChannelPool to add a penalty for channels that have recently experienced server errors that are likely to be transient. The new logic uses an "adjusted" outstanding RPC count, which includes a penalty for errors like UNKNOWN, UNIMPLEMENTED, INTERNAL, UNAVAILABLE, and DATA_LOSS. This will help to route traffic away from temporarily misbehaving servers and improve load balancing.
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This change modifies the channel selection logic in BigtableChannelPool to add a penalty for channels that have recently experienced server errors that are likely to be transient and likely to be solved by picking a different server.