Add MIME types for video/3gpp and video/3gpp2

Feature or enhancement

Proposal:

the audio versions of these containers are already supported

https://github.com/python/cpython/blob/4b63cd170e5dd840bffc80922f09f2d69932ff5c/Lib/mimetypes.py#L527-L530

the video versions should be too. They are already registered with IANA here: https://www.iana.org/assignments/media-types/media-types.xhtml

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

Issue where those audio/ mimetypes were added https://github.com/python/cpython/issues/87160

Linked PRs

• gh-122632

從 Lib/mimetypes.py 中參照的第 527-530 行開始，這裡註冊了音訊容器 MIME 類型。新增對應的視訊類型，並驗證 video/3gpp 和 video/3gpp2 都能被識別，同時以現有的 issue 87160 變更作為上下文。