Implement new "gatewayclass" controller for GWAPI and OSSM configuration

Introduce a new "gatewayclass" controller, which does the following:

1. Creates a GatewayClassCRD
2. Watches gatewayclasses that have the controller name: spec.controllerName: openshift.io/gateway-controller.
3. Instantiates Istio via creating an SMCP with the appropriate configuration as specified in the EP
4. Installs the other Gateway API CRDs supported (Gateway, HTTPRoute, Reference Grant)

Previous Work:

Miciah has implemented the majority of this in https://github.com/Miciah/cluster-ingress-operator/commits/gateway-api during shift week, however, there are details that have changed since due revisions in the EP, and the implementation needs to be updated.