Improve and add authorization to function download and upload #4644
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Motivation
Currently, the download and upload function endpoints do not have any authorization which allows any authenticated user to download or upload anything.
Modifications
For the existing download or upload endpoints, only allow superUsers be able to access these endpoints.
Add a download endpoint with authorization that allows users to download function package. The endpoint takes parameters tenant, namespace, and name. Then the latest function package will be returned.
Allow pulsar-admin to use that endpoint as well.
Change KubernetesRuntime to use that as well
Not sure why we have an upload endpoint. Not really used anywhere. We should probably just remove it in the future.