Add option to use PROXY protocol to preserve client IPs on haproxy-route-tcp

[Thanhphan1147]

Enhancement Proposal

https://www.haproxy.com/documentation/haproxy-configuration-tutorials/proxying-essentials/client-ip-preservation/enable-proxy-protocol/

Some backends might want to know the client IP address, especially in TLS passthrough mode. The charm would need to allow requirers to configure this via the relation data.

Note that the requirer application would also need to expect that haproxy is doing this for the backend connection to work.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/ISD-5164.

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