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Fix #85

There could be case where someone only needs the ability to upload videos without having to transocode them.

It would also be useful while #65 is solved

The idea of adding that block was to have the ability to remove transcodes. I'll create another PR to solve that issue.

Using Cloud Storage could generate urls like:

`https://storage.googleapis.com/<BUCKET_NAME>/<PATH>/testwebm?Expires=1612931745&GoogleAccessId=<ACCOUNT>&Signature=<SIGNATURE>`

Passing parameters to the URL returns None in mime.guess_type(url)

Also, extracting the mimetype to some property that can be reused. Similar to https://github.com/wagtail/wagtail/blob/master/wagtail/documents/models.py#L170