fuzz: add example fuzzing targets #1949
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Description
this PR adds
cargo-fuzz
fuzzing targets for harper parsers.Ideally, we wouldn't just fuzz the parser, but also the linting step with the resulting tokens to cover the
harper-core
code.Notice that I had to turn of
lto = true
in the workpace Cargo.toml, so maybe we want to figure out how fuzzing can coexist with lto before merging.Related: #1898 #1948
Demo
Example of fuzzing run finding a crash: https://asciinema.org/a/ShdOcwthkwwn72JyGpRk9emOu
Checklist