Use a separate secret for each file in extraFiles

[M4C4R]

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Proposed change

It seems that this was considered in https://github.com/jupyterhub/zero-to-jupyterhub-k8s/pull/2006 but decided that a single secret would be used for now.

I would like to now ask that separate secrets be used for each file to overcome the secret size limit.

Alternative options

This was already a consideration.

Who would use this feature?

Users who wish to mount a potentially growing number of files.

For example, we plan on mounting sample notebooks to the user's pod, and do not want to have to create a new Docker image each time we decide to add new files.

(Optional): Suggest a solution

Loop over extraFiles and create individual secrets for each file.

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