Add route annotation for setting proxy-body-size in RHOCP4

1. Proposed title of this feature request

Add proxy-body-size annotation with OCP 4 route to limit the maximum no. of bytes HAProxy will allow on the body of requests. 

2. What is the nature and description of the request?
OCP 4 route should have the functionality to set the max size of the client request body via route annotation.

3. Why does the customer need this? (List the business requirements here)

Currently, the default value is unlimited. It should be added as functionality to set the max upload size. 

The Nginx ingress controller has this annotation:
nginx.ingress.kubernetes.io/proxy-body-size: "600m"

4. List any affected packages or components.

Route, IngressController