reverse_conn: envoy contrib changes for reverse_connection custom cluster #37932
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Commit Message: This PR defines a new custom cluster type "envoy.clusters.reverse_connection" which enables requests to be sent over reverse connections instead of forward connections. This PR is strictly tied with #37368.
Additional Description: In order to differentiate between requests that need to be sent via a reverse connection vs those to be sent through forward connections, a new cluster type has been defined. The downstream requests to be sent over reverse connections are expected to contain either of the HTTP headers defined in the cluster's typed config, to enable upstream envoy to figure out which downstream node to send the request to,
The Cluster Manager checks whether the connection is intended for a reverse connection cluster, and if so, calls a custom HTTP/2 conn pool to send the request over the reverse connection.
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Testing:
Docs Changes:
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Platform Specific Features:
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