Friendlier OOP API?

**What is the feature and why do you need it**:

I'd love to be able to do something like this:

```python
from kubernetes.client import ExtensionsV1beta1Ingress as Ingress

...

for ingress in Ingress.list(namespace="default"):
ingress.metadata.labels["foo"] = "bar"
ingress.patch()
```

**Describe the solution you'd like to see**:

Implementing a bunch of default class methods and properties such as `list` and `list_namespaced` (or maybe `list(namespace="...")`), as well as instance methods such as `delete` and `patch`.

I know that this feature proposal is rather succinct, and I'm sorry about this, but I'd love some feedback before moving in any direction. Maybe this is too much of a change and would be simpler implemented in another library based on this client?

Review the existing ExtensionsV1beta1Ingress usage and the proposed list, list_namespaced, delete, and patch methods. The issue names no files or tests and does not define a concrete done condition; first clarify the API design and compatibility expectations before implementation.

Written by the indexing model from the issue text.