Integrate with google/oss-fuzz for continuous fuzz testing?

Hey folly team,

I've recently become interested in folly. I'd like to suggest and champion an effort to set up some basic fuzz-testing and combine it with google/oss-fuzz for continuous fuzzing. I'm fully aware that you are very busy people and I don't want to overload your review/maintenance capacity. Is this a bad time to discuss potential security/reliability improvements?

If you're not familiar with fuzzing or oss-fuzz I've included a few brief notes below.

#### **Benefits of Fuzz-Testing**

- **Dynamic Code Testing**: Fuzz-testing challenges systems with unexpected data, aiming to identify vulnerabilities or bugs. It’s akin to an exhaustive stress-test for the code.
- **Detecting Hidden Vulnerabilities**: It can uncover potential weaknesses that may not be evident in routine tests.
- **Continuous and Automated Testing**: With tools like Google’s OSS-Fuzz, fuzz-testing can be automated, running continuously on distributed systems, ensuring daily resilience checks.

#### **Google/oss-fuzz for Continuous Fuzzing**

- **Automated Fuzzing**: OSS-Fuzz undertakes comprehensive fuzz-testing daily on a distributed cluster.
- **Detailed Reporting**: OSS-Fuzz offers exhaustive reports in case of detected anomalies, enabling effective action.

I’d be more than happy to lead the effort in integrating fuzz testing with the folly and assist in any way required.

#### Prior integrations
There have been a number of previous integrations completed with facebook repositories and google/oss-fuzz including;
- facebook/time
- facebook/zstd
- facebookexperimental/starlark-rust (this was me)
- facebook/proxygen
- facebook/hermes
- facebook/rocksdb

As a proof of concept I created a couple of super simple fuzz harnesses for `json.h` and `Format.h` in #2120