Add Flight Speed exif reading for DJI Air 2S

[aleottantotto]

DJI Air 2S EXIF speed tags have a different format than the standard one, therefore in rolling shutter correction algorithm speeds are based on positions instead of using speeds recorded by the drone

[pierotofy]

Test image: https://www.dropbox.com/scl/fi/i4z2834lflt2j2qfpkvd6/DJI_01803.JPG?rlkey=1bdp05m0yzmyb1lclmicb6j0p&dl=0

[pierotofy]

It seems that exifread has some issues reading the tags for this sensor:

'MakerNote SpeedY': (0x0004) ASCII=b'\xf0\xbet\x80\xe0\xf5\xe3*x\x07\x83\xc8\xf8#\xf6\xcb\xfd\x9b\x7fm, ... ] @ 1376271, 'MakerNote Tag 0x0000': (0x0000) Byte=[] @ 655360001, 'MakerNote SpeedZ': (0x0005) ASCII=b'q<\xb6v\xf9%\x15p\xc1\x89\xde\xa0\x0c\xe3%@<\xad|\x8e, ... ] @ 3407898

SpeedX is also missing, which hints that the tag offsets are not being read correctly. This might be non-trivial to fix.