Allow `SetResourceForStruct` to be called for non top-level CRD fields

[a-hilaly]

Currently we are unable to use GoCodeSetResourceForStruct for fields that are not top-level CRD fields, which causes issues when trying to generate custom code that transforms an eventbridge v1alpha1.Target to an svcsdk.Target.

Ideally we should allow users to call GoCodeSetResourceForStruct for any field, not just CRD top level fields. This will fix the issue and allow users to generate custom code for fields that are not part of a CRD spec or status.

[jaypipes]

@a-hilaly when you write "fields that are not part of a CRD spec or status", are you referring to fields that are not top-level fields in the Spec/Status? Because I don't see a reason to use SetResourceForStruct for fields that aren't part of a CRD...

[a-hilaly]

@jaypipes Yes i'm referring to non top-level CRD Fields. Changing the description and title