Add video_embed or --embed argument to ManimMagic

[mforbes]

Description of proposed feature

Add an embed flag to the ManimMagic so that the user can control whether or not videos are embded.

Currently video_embed = "google.colab" in str(get_ipython()) is hardcoded to be enabled on Google's CoLab, but there are other places this can be useful, for example, when generating documentation using Sphinx or JupyterBook.

How can the new feature be used?

From the example:

%%manim --embed -v WARNING --disable_caching -qm BannerExample

config.media_width = "75%"

class BannerExample(Scene):
    def construct(self):
        self.camera.background_color = "#ece6e2"
        banner_large = ManimBanner(dark_theme=False).scale(0.7)
        self.play(banner_large.create())
        self.play(banner_large.expand())

This would embed the video in the notebook and output, allowing it to be displayed in other contexts.

Additional comments

This is a rather trivial change. I will submit a PR shortly once I explore a bit to see what the best naming options are.

References

The following may be relevant/useful:

• Adding videos in JupyterBook
• Add support / docs for adding movies to a book executablebooks/jupyter-book#1249
• Resizing images and videos in a jupyter notebook #1312
• Jupyter: Same frame for images and videos #1243