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contractcourt: add rapid derived fuzz test for HtlcAuxBlob

In this commit, we add a rapid derived fuzz test for the HtlcAuxBlob
test. This uses the rapid (randomized property testing) into Go's built
in fuzzer. This wrapper will use the fuzz stream, and pass that into
rapid where the stream is used to make structured test inputs which are
tested against the existing properties.

This can be done more widely in the codebase, we pick a simple example
to port first before tackling others.