[hdf5] read rotation motor from "technique/scan/motor"

Closes #62

See merge request !59

- to activate this option the H5_ROT_ANGLE_KEYS should be set to None
- close #62

[converter][hdf5] save tomo_n

See merge request !58

If so stop the conversion at this step.

[acquisition] register sample_name and group_size if possible

See merge request !55

[CI] add python 3.9 test

See merge request !54

Add fov user param

Closes #59

See merge request !53

close #59

close #58