tests(fuzz): Add parse_duration fuzzing target

[caspermeijn]

Add a fuzzing target for parsing into a Duration.

[caspermeijn]

@mumbleskates This is the other fuzzer I used for my testing. Do you have suggestions?

[mumbleskates]

this looks pretty good. in the fuzzer i have committed so far i also added some regex that helps assert that anything we successfully parsed actually looks reasonable and like we expect, so we don't end up accidentally parsing something that looks really strange. for this case that should be a super simple pattern.

[caspermeijn]

this looks pretty good. in the fuzzer i have committed so far i also added some regex that helps assert that anything we successfully parsed actually looks reasonable and like we expect, so we don't end up accidentally parsing something that looks really strange. for this case that should be a super simple pattern.

I found that the regex made the test less readable. If we can roundtrip the text, then it can't be that strange, right?

[mumbleskates]

that is a reasonable enough logic! i find regex pretty tractable personally but that obviously varies wildly from person to person. works great without it 👍