Add ClusterFuzzLite integration

[DavidKorczynski]

This adds fuzzing by way of ClusterFuzzLite, which is a GitHub action that will perform a short amount of fuzzing for new PRs. The goal is to use fuzzing to catch bugs that may be introduced by new PRs.

I added a fuzzer that targets the parsing logic, and currently set the timeout of CFLite to 180 seconds. CFLite will flag if the fuzzer finds any issues in the code introduced by a PR.