Added iter methods to ObjectList

[kitfre]

Added iter and iter_mut methods to ObjectList to provide Iterators, as well as implementations of IntoIterator for ObjectList, &ObjectList and &mut ObjectList

#41

[clux]

This is solid. Examples are really good, code is clean. Just a few typos in there that causes CI to fail atm.

Will definitely merge this when it passes, but I just have a small request:

change the pod_openapi.rs example to use the simpler iterator. it's currently doing a for p in pod.list().items.!

[kitfre]

I had to add ListMeta to the public exports for use in the example in the docs on the new iter methods, is this okay or should I just cut out the examples?

[clux]

that should probably be public anyway 👍

thanks for pointing it out though. the re-formatting made that hard to spot.

[clux]

Thanks a lot!

[clux]

Released in kube 0.20.0 :-)

[kitfre]

Awesome thanks! There's a good chance I pick at a couple other issues as well, rust and kuberentes are two of my favorite things and this project is awesome 🦀