Add support for custom MIME types

[alec-kr]

Problem

Support for webp images was recently added in JupyterLab. (View the PR: jupyterlab/jupyterlab#13066)

However, it was noted by @fcollonval here, that this mimetype is not supported in the Python mimetypes library used in Jupyter Server, but it is set to be released in Python 3.11.

Proposed Solution

I noticed that mimetypes.add_type('image/webp', '.webp') seems to solve this issue, by adding a custom webp mimetype. However, I am not sure where this code snippet should be implemented. I am looking for some advice, since I would like to work on this issue. I was also told that @Zsailer may be able to assist me with this.

Links

JupyterLab PR that added webp support: jupyterlab/jupyterlab#13066 cpython PR that adds webp image format: python/cpython#29259 @fcollonval's comment describing the issue

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