an example to manually impl JsonSchema for merge strategies

[clux]

an addon, and illustration of the more manual parts of #129

[kazk]

Not directly related to this PR, but I think Arnavion/k8s-openapi#86 can be done with similar impl JsonSchema for newtype wrapping k8s_openapi type. Can you try it? I'll look into it later if not.

[clux]

Ah, yes, that might work as well. I'll have a go, but a bit busy till Wednesday. CURIOSITY WINS

[clux]

Ah, read that issue a bit more. Yeah, I think it would work with something like:

// Newtype on PodSpec to allow implementing JsonSchema on k8s_openapi types
#[derive(Serialize, Deserialize, Debug, Default, PartialEq, Clone)]
struct PodSpec(k8s_openapi::api::core::v1::PodSpec);
impl JsonSchema for PodSpec {
    fn schema_name() -> String {
        "PodSpec".into()
    }
    fn json_schema(_: &mut SchemaGenerator) -> Schema {
        schemars::schema::Schema::deserialize(k8s_openapi::api::core::v1::PodSpec::schema()).unwrap()
    }
}

although not something that can be done atm as k8s_openapi::...::PodSpec::schema() is just a hypothetical thing.

EDIT: well, seems i was wrong. but let's discuss over at the referenced openapi issue.