Add get_api_resources to the custom objects API

[JacobHenner]

The custom objects API spec did not expose GET /apis/{group}/{version} whereas most of the built-in APIs do (as get_api_resources()). This change adds the getCustomObjectsAPIResources operation to the custom objects API spec, which will expose GET /apis/{group}/{version} for arbitrary custom resources (as get_api_resources(group, version) in generated clients).

Fixes #231

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[brendandburns]

/lgtm /approve

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[APPROVALNOTIFIER] This PR is APPROVED

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

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