Evaluate GEP on Merging Multiple Gateways

[mpstefan]

We need to evaluate the following GEP in the Gateway API to determine its feasibility as written:

kubernetes-sigs/gateway-api#1863

Acceptance

• The above GEP is evaluated to determine if the new functionality present is feasibly implementable by NGINX.
• The GEP has a review added explaining the results of the evaluation, including any improvements necessary to support NGINX, if applicable.