Consider switching fuzzer backends to LibAFL

[obi1kenobi]

LibFuzzer is in maintenance mode:

The original authors of libFuzzer have stopped active work on it and switched to working on another fuzzing engine, Centipede.

We should consider switching to LibAFL or another implementation, since it seems that we can get both fuzzing performance and maintainability improvements.

More info: https://hachyderm.io/@[email protected]/110820552409622753 https://github.com/rust-fuzz/cargo-fuzz/issues/330