projects: add ata-validator

[mertcanaltin]

JSON Schema validator built on simdjson and RE2.
https://github.com/ata-core/ata-validator

[github-actions]

mertcanaltin is integrating a new project:
- Main repo: https://github.com/ata-core/ata-validator.git
- Criticality score: 0.28911

[mertcanaltin]

Hi @DavidKorczynski, could you take a look when you get a chance? We'd like to add ata to Google Fuzz.
We're currently discussing adding it to Node.js core nodejs/node#62603 , and I'd really appreciate your review and support.

For some context, ata is an open-source JSON Schema validator built on simdjson and RE2. It's a native C++ implementation with JS codegen on top. It's significantly faster than ajv on both cold start and steady-state validation, and uses RE2 so there's no backtracking risk.

Spec coverage is at 98.5% for Draft 2020-12 with full $dynamicRef support.

Given the C++ core and regex engine, it seems like a good fit for fuzzing. Would love to hear your thoughts!