Adding WebAuthn (P-256) Support to Clarity for Native Passkey Integration

We had @raphasierra.id.block and @brice on last Friday’s SIP call talking about the recent addition of "secp256r1” in SIP-031 Clarity 4 Upgrade, specifically to give more context to this feature.

TLDR: native Clarity 4 support to add foundation building blocks to allow app/wallet builders to create more secure onboarding feature.

:tv: You can watch the replay via this link: https://x.com/i/broadcasts/1YqGolOylmXJv
Starting from 1:58:25 timestamp.

:round_pushpin: SIP approval update: Technical CAB has reviewed SIP-031 including secp256r1 support and given it thumb up, therefore we are proceeding to public vote around 15th October.

:open_book: You can contribute by jumping into the Github PR reviewing the SIP too: Clarity 4: high-demand new builtins by obycode · Pull Request #218 · stacksgov/sips · GitHub