Make Api::apply as an alias for Api::patch with server-side mode

[clux]

So we have a nice interface to server-side apply (limit to kubernetes version >=1.16)

[clux]

Perhaps Api::update would also be a useable name, given there are two ways to do it.

[clux]

A potential, require the whole K and have as a shorthand replacement for Api::replace:

    /// Server side apply a yaml patch over a named resource
    ///
    pub async fn apply(&self, name: &str, patch: &K) -> Result<K>
    where
        K: Serialize,
    {
        // TODO: ApplyParams shorthand? for now...
        use crate::api::PatchStrategy;
        let ssapply = PatchParams {
            patch_strategy: PatchStrategy::Apply,
            // always override on conflicts
            force: true,
            // owner of the fields: (us)
            field_manager: Some(env!("CARGO_PKG_NAME").into()),
            ..Default::default()
        };
        let bytes = serde_yaml::to_vec(&patch)?;
        let req = self.api.patch(name, &ssapply, bytes)?;
        self.client.request::<K>(req).await
    }

Now of course this does not let people supply partial patches like the PatchParams::default (json merge) lets you. But this is actually kind of good at the moment, because kubernetes will force any optionals on our K to null if we leave them out (even if they are missing from the serialization). I.e.
you actually force options to None even if they were set before if you miss them out.

So lacking a good solution to #129 (which I think would let us customize that behaviour / hook it into our serde skip_serialize behavior), it's not a good plan to let people supply partial yaml to server side apply on CRDs. If they need partial application, they need to stick with json merge until we have support for that.

[clux]

This is probably a mistake. Going to just do this with a constructor alias on PatchParams.

[nightkr]

Yeah.. apply and patch have vastly different types (Partial<K> and JsonPatch<K> respectively, though neither can be expressed natively in Rust today).