Add extra path

[souvikg10]

request the ability to add additional paths to the ingress of the rasa open source ingress so expose /api endpoint of rasa.
I borrowed the idea from rasa-pro charts to add the additional Paths in open-source ingress.

Let me know if this is okay.

[camattin]

This should not be needed. As it is today ingress object for open-source-api forwards the complete URI back to the rasa pod with /core removed when the URI starts with /core.
e.g. https://my-rasa-x.foo.com/core/myspecial/endpoint will result in the URI being /myspecial/endpoint when it hits the rasa pod.

[souvikg10]

well they tried that and it didn't work :( we had to specifically add the ingress in the cluster to reach the api endpoint