v0.1.2: Initial via-kubectl-raw Patch support

Also exports the Reflector implementation and plumbs unstable/via-kubeconfig.ts more.

v0.1.1: Add generic Reflector

Copy of notes from reflector.ts:

Implementation of a Kubernetes List/Watch client which furnishes a view of the watched data.
This is commonly called a 'Reflector' among the client libraries, though this one is less standard.

The core class here is a bit generic and tries to depend mostly on things within this file.
This is because a Reflector works pretty directly with Kubernetes API objects,
while this overall kubernetes_client module only serves as an API access path.
So you'll be furnishing your exact API structures by instiantiating the Reflector class.
(Usually the API will be from /x/kubernetes_apis/builtin/meta@v1/struct.ts but it can vary)

This class/file work fine, but the types and APIs are still unstable while I figure out
what's necesary for various usecases.
Please file issues or start discussions if you have any input!

The new module is not imported anywhere, it is a standalone addition. This will likely remain so until I"m more confident in the API.

Also, added contentType to the request options contract. This will be used for patching.

Initial publication, with KubectlRaw and InCluster clients

Also includes ReadableStream transformers, useful for consuming watch streams.

There's a handful of other stub transports, which will be more important later on.