[C++][CI] Use differential fuzzing

[pitrou]

Describe the enhancement requested

We can leverage differential fuzzing to find more bugs using our existing fuzz targets.

For example, our IPC file fuzzer exercises the IPC file reader with both pre-buffering enabled and disabled. If both are successful, it would be useful to compare the respective results and assert that they are equal, otherwise there is a bug in the implementation.

Component(s)

C++