contractcourt: add rapid derived fuzz test for HtlcAuxBlob

[Roasbeef]

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.

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