feat: add GET listCustomObjectForAllNamespaces

[davidxia]

for the API path /apis/{group}/{version}/{plural}. We define a new key /apis/{group}/{version}/{plural}#[U+200E] in custom_objects_spec.json to work around this limitation.

OpenAPI defines a unique operation as a combination of a path and an HTTP
method. This means that two GET or two POST methods for the same path are not
allowed.

— https://swagger.io/docs/specification/paths-and-operations

We use the hair space empty character to visually hide this path param from the Swagger UI.

addresses #268

Work around was taken from here.

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[brendandburns]

@davidxia thanks for the PR, this looks good to me, have you tested it with code generation?

[davidxia]

have you tested it with code generation?

With this settings file

export KUBERNETES_BRANCH="master"
export CLIENT_VERSION="31.0.0b1"
export PACKAGE_NAME="client"

I ran from root of this repo openapi/python.sh kubernetes settings. I diffed custom_objects_api.py between the one generated here and the latest one from kubernetes-client/python. See gist of diff. The important part is this in the function list_custom_object_for_all_namespaces_with_http_info().

>         return self.api_client.call_api(
>             '/apis/{group}/{version}/{plural}#', 'GET',

Here's the full generated Python client and link to list_custom_object_for_all_namespaces(). Lmk if this looks good or other things I should test.

[brendandburns]

Thanks, looks good to me.

/lgtm
/approve

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This pull-request has been approved by: brendandburns, davidxia

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[davidxia]

@brendandburns Amazing, thank you. Are there any docs on or do you know the release cadence of clients from changes in this repo? For kubernetes-client/python it looks like an ad-hoc cadence?