Ability to export poses in various formats

[niksirbi]

In particular, either DeepLabCut or SLEAP. This would be useful for converting between formats, especially for downstream analysis tools that are only made for one specific format.

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1. Pose tracks io #33
   +0
2. Ability to save multi-animal pose tracks to single-animal files #39
   enhancement +1
   
3. Export pose tracks to SLEAP analysis file #46
   enhancement +1
   
4. Export pose tracking data to zarr #45
   enhancement +1
5. I/O support for the ndx-pose NWB extension #23
   enhancement +1
6. Pick a movement-native file format #341
   +0
7. Implement I/O for parquet files #307
   enhancement +1

[niksirbi]

In PR #33 I have included a save_poses.to_dlc_file() function that exports data in DeepLabCut format (see however #39).

Apart from that we need additional export options:

• a movement-native format, suitable for xarray objects (most likely zarr)
• save_poses.to_sleap_file() that probably writes a SLEAP analysis.h5 file
• ndx-pose NWB? see I/O support for the ndx-pose NWB extension #23

[niksirbi]

I will keep this issue open to have an overview of the overall progress on exporting functionalities.
Meanwhile, I've created separate smaller issues for each format and added them to this isse as a Tasklist.

[niksirbi]

Since this is a central goal of movement, and will always be, so it doesn't make sense to keep this tasklist forever open.
Therefore, we decided to close it, but keep the individual issues open.