ARROW-10400: [C++] Propagate TLS client peer_identity when using mutual TLS
ARROW-10400: [C++] Propagate TLS client peer_identity when using mutual TLS

https://issues.apache.org/jira/browse/ARROW-10400

Closes #8537 from raduteo/ssl_user_identity

Authored-by: Radu Teodorescu <4df670cf5f46377d91af2c8ee83bce5d3974d1e0@yahoo.com>
Signed-off-by: David Li <dc24f9cfc84fb1675ce65c8444a2c3e2f0e5f297@gmail.com>

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