[Feature] golang package for creating `alb.networking.azure.io/v1` API resources programmatically

**Is your feature request related to a problem? Please describe.**

I am developing a Kubernetes operator that will have create resources from `alb.networking.azure.io/v1` (in my case `BackendTLSPolicy` for now)

Those resources are not covered by Gateway API yet (there is another issue for 1.5+ support, see: https://github.com/Azure/AKS/issues/5333)

Even though most of the resources will be covered by Gateway API in the future, I assume some Azure-specific APIs will remain under `alb.networking.azure.io/v1` group and version.

I would like to have a clean Go package to create or serialize those API resources programmatically.

I found those APIs have been copied in the migration tool (from AGIC to AGC): https://github.com/Azure/Application-Gateway-for-Containers-Migration-Utility/tree/main/crds/v1 but that does not look like a clean package.

**Describe the solution you'd like**

Have an official Go package with Go doc for `alb.networking.azure.io/v1` APIs.

**Describe alternatives you've considered**

Alternative is to use: https://github.com/Azure/Application-Gateway-for-Containers-Migration-Utility/tree/main/crds/v1 for now

**Additional context**
Add any other context or screenshots about the feature request here.