Allow CRD to implement PartialEq trait

[ctron]

This change allows the dervie CustomResource to implement the PartialEq trait.

This helps in creating reconcile loops, checking if the resource has changed while processing. Similar to the DeepEquals on the Golang side.

[clux]

Yeah, that makes complete sense. Thanks for this.

I think maybe an optimal solution would add PartialEq if the struct itself also tries to derive it, that way we have less #[kube(attrs)] when the crate could perfectly well figure it out, but this solution works fine. Will merge it later in the evening.

[ctron]

Thanks for merging!

I think maybe an optimal solution would add PartialEq if the struct itself also tries to derive it, that way we have less #[kube(attrs)] when the crate could perfectly well figure it out, but this solution works fine.

Yes, I wanted to have this as well. However, I wasn't able to figure out how to get access to the derive macro content while processing CustomResource.

[clux]

Yeah, not sure either atm (though haven't had time to really look). So have opened an issue around this and how to deal with extra traits in general: #243