Not able to use TCP/TLS proxy

[ptrautberg]

Describe the bug
Application Gateway is now offering TCP/TLS proxy, eg. for connecting to DB instances (link). Similar, this functionality can be used to access cluster-hosted dbs (statefulsets) using APP GW's private FE, but AGIC annotations do not include that.

[source]

Also, the same is missing for health-checks. There is no such annotation like appgw.ingress.kubernetes.io/health-probe-protocol, which would allow to set custom health probe protocol. This is a must-have when using APP GW with TCP PROXY.

To Reproduce
Configure ingress using TCP/TLS protocol, instead of HTTP(S).

Ingress Controller details
Image: mcr.microsoft.com/azure-application-gateway/kubernetes-ingress:1.7.4