Image file format python script (see #705)

[felixS27]

As discussed in #705 I created the python script to read different image file formats and access their metadata.
The script is formatted similar to other python activities.
The script includes:

• environment specifications
• how to load different image file formats and access their metadata
• a little exercise with the example .czi file
• a little exercise where the participants should try out BioIO on their own images
• how to save images
  The script does not include:
• visually inspect the image with napari or similar
  I realized that for ImageJ there are two activities. One for open and inspect images and one for saving. The question is, if I should split the script to meet this configuration or if I should leave it like that and maybe just reference the script twice on the module page.
  I also updated the _module folder to have the python script integrated in the activity drop down menu.
  I hope I didn't forget anything. Otherwise please tell me and I can add/change things.

[tischi]

Looks awesome!
Thanks so much!!