Support defining multiple rules in one httproute

[IbraAoad]

Enhancement Proposal

By default, the HTTPRoute resource is designed to accept multiple rules (for example traffic going to /bar to go to service A and /foo to goo to service B, see this example), we need to extend the ingress_per_app v2 to allow the requirer to pass multiple rules

[sed-i]

• ingress_per_app should support natively being able to take multiple routing rules instead of needing to form multiple relations. Could try to extend it in a backwards compatible way.
• or maybe it's actually ok to have multiple ingress relations.
• or, interoperate/collaborate with https://github.com/canonical/gateway-api-integrator-operator.