Add ClusterFuzzLite for CI fuzzing

[maxammann]

The CFL toolkit allows fuzzing in each PR and also scheduled once every 6 hours for 1 hour.

The corpus is shared between all workflows, however only the scheduled one can update the corpus. Every day the corpus is pruned and coverage is calculated. The corpus and coverage remains private.

Found crashes are public.

[maxammann]

The private corpus is currently stored in this private repo: https://github.com/trail-of-forks/fuel-vm-fuzz-corpus

[maxammann]

This is ready now. Note that you maybe want to remove the existing fuzz_targets/grammar_aware.rs fuzzer which is broken. That would also remove the arbitrary dependency.

[netrome]

Superseded by https://github.com/FuelLabs/fuel-vm/pull/820