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).

首先追蹤產生的 Kubernetes 模型類別是如何建立的，以及它們目前如何繼承自 object。接著評估所提議的共用資源基底類別，以及 utils.parse_from_yaml(yaml_file) 這個進入點。完成的條件是決定 kind、apiVersion、metadata 和 spec 共用欄位的設計，並在不發出 API 請求的情況下，將 YAML 解析為正確的模型。

由索引模型根據 Issue 內容生成。