Add m4e pixel patch

[TrevorBurgoyne]

M4E Pixel Pitch — Derivation

Value added

DJI_PIXEL_PITCH["M4E"] = {5280: 3.28e-06} (meters), keyed by image width, for
the Wide (mapping) camera only.

Derivation

From the DJI Matrice 4E spec sheet (Wide camera):

• Image Sensor: 4/3-inch CMOS (nominal active width ≈ 17.3 mm)
• Max Photo Size: 5280 × 3956 px

pixel pitch = 17.3 mm / 5280 px ≈ 3.28 µm = 3.28e-06 m

The already-supported M3E (Mavic 3 Enterprise) shares the identical sensor
(4/3" CMOS, 20 MP) and image size (5280 × 3956) and is also coded as 3.28e-06.

Caveat / scope

This value applies only to the Wide camera. The M4E's Medium Tele (1/1.3"
48 MP, width 8064) and Telephoto (1/1.5" 48 MP, width 8192) lenses report the
same Image Model (M4E) but have different pixel pitches. Because we have no
sample images for those lenses, they are intentionally not supported:
pixel_pitch_meters() resolves the M4E entry by image width and raises a
ParsingError for any non-Wide width. When sample data is available, add the
8064 / 8192 width keys to DJI_PIXEL_PITCH["M4E"] to enable them.

Lenses can also be distinguished via FocalLengthIn35mmFilm (24 = Wide,
70 = Medium Tele, 168 = Telephoto).

Why?

• currently parser.focal_length_pixels() fails with KeyError: 'M4E'

PR Checklist

• Merged latest master
• Updated version number

Breaking Changes

[hennels]

Looks good and makes sense to me.
I'm a little scared that images from the other lenses you mention will silently just produce bad data in the current state. It is probably worth setting something up to cause an explicit error for the other lenses of the M4E to be sure that doesn't happen. Or just support all of them at the same time.

[hennels]

Looks good! Thanks for adding the error.