test(fuzz): cover other image types

[tristan-f-r]

I license past and future contributions under the dual MIT/Apache-2.0 license,
allowing licensees to choose either at their option.

Adds fuzz targets for the QOI, OpenEXR, and Farbfeld image formats

[fintelia]

Have you checked whether these formats pass fuzzing?

We already have more fuzzing crashes than we have contributor bandwidth to fix, so I don't think wiring up more failing fuzzing harnesses will achieve much

[tristan-f-r]

Have you checked whether these formats pass fuzzing?

I already checked that those formats pass fuzzing for around 20 minutes.

We already have more fuzzing crashes than we have contributor bandwidth to fix, so I don't think wiring up more failing fuzzing harnesses will achieve much

That makes sense, though I doubt these added targets will throw out false positives.