Use controller-gen to generate CRDs instead of writing them by hand

[tokers]

Currently, we write CRDs by ourselves, it's tedious and error-prone. We should use tools like controller-gen to generate them so that we can focus on the changes of go data structures, and let it do the rest jobs.

[tokers]

@gxthrj @tao12345666333 @lingsamuel

[lingsamuel]

To do so, we need to remove usage of: any type (interface{}), float64 (or enable allowDangerousTypes=true flag).

And add markers like this.

[tokers]

To do so, we need to remove usage of: any type (interface{}), float64 (or enable allowDangerousTypes=true flag).

And add markers like this.

Got it.

[lingsamuel]

xref: https://github.com/apache/apisix-ingress-controller/pull/689#issuecomment-927212290

[lingsamuel]

If any CRD validation rules cannot be represented by markers, we should ensure that they are migrated to our code.