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

从 Lib/mimetypes.py 中引用的第 527-530 行开始，这里注册了音频容器 MIME 类型。添加相应的视频类型，并验证 video/3gpp 和 video/3gpp2 都能被识别，同时以现有的 issue 87160 更改作为上下文。