Implement base class for Kubernetes model classes

This is a feature request. Most of the Kubernetes objects have a set of fields in common:

* kind
* apiVersion
* metadata
* spec

Currently the various model classes all inherit from `object`. Is there a way to implement a base class for all k8s resources and have all the models extend that?

It'd also be nice to have `utils.parse_from_yaml(yaml_file)` that just parses a YAML file into the correct model (no API requests at all). I'm not sure how the models are generated, but I suspect it may be related to this [analogous java client issue](https://github.com/kubernetes-client/java/issues/101).

Start by tracing how the generated Kubernetes model classes are produced and how they currently inherit from object. Then assess the proposed common resource base class alongside the utils.parse_from_yaml(yaml_file) entry point. Done would mean a decided design for shared kind, apiVersion, metadata, and spec fields plus YAML parsing into the correct model without API requests.

Written by the indexing model from the issue text.