pqc support

[tchaikov]

Hi folks,

I'm exploring the integration of post-quantum cryptography (PQC) support for mTLS in Pipy, leveraging liboqs and oqs-provider for the implementation.

The goal is to enable quantum-resistant algorithms for mutual TLS authentication, which would help future-proof Pipy's security capabilities as quantum computing advances. Before I proceed with the implementation, I'd appreciate feedback on this approach:

Does this align with Pipy's roadmap and architecture?
Are there any existing efforts or considerations I should be aware of?

If there's interest and the approach seems sound, I'm happy to contribute this enhancement back to the project.

Thanks for your input!

cc @caishu97