Add support for user configurable ingress-nginx settings

[nilsgstrabo]

Add support for configuration of specific ingress-nginx settings, like request/response size limits, timeouts etc, for specific component ingresses in section network.ingress.public in radixconfig.yaml.

The only way a user can control the ingress configuration is via the ingressConfiguration field in radixconfig. This field offers little flexibility since it contains a set of predefined settings and values, like the websocketfriendly option.

I suggest we add support for the following settings in the first iteration:

• clientMaxBodySize - https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#custom-max-body-size
• proxyReadTimeout- https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#custom-timeouts and https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout
• proxySendTimeout - https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#custom-timeouts and https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_send_timeout

Perhaps some of the load balancing/affinity settigs: https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/#load-balance

ingress-nginx annotations: https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/

[nilsgstrabo]

Implemented: #1204
Original issue: https://github.com/equinor/radix/issues/155