reverse_connection: custom conn pool that sends requests through reverse connections #37931
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Commit Message: The reverse connection custom connection pool is invoked by the cluster manager when a request needs to be sent via a reverse connection instead of a forward connection, as described in this github issue. This custom conn pool's calls ReverseConnectionHandler (defined in the bootstrap extension) and creates a new connection over a cached socket, instead of creating a new forward connection to downstream envoy.
This PR is strictly tied with #37368.
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