SIMD-0075: Precompile for Secp256r1

[0xRigel]

Problem

There currently isn't support for signature verification of signatures on the NIST-P256 curve (primary curve used by Passkeys). Motivation and details can be found in SIMD-0075

Summary of Changes

• Adds a precompile for secp256r1 signature verification that implements the structure defined in SIMD-0075 and that abides by the rules set forth in SIMD-0152
• Adds a separate secp256r1 crate to avoid further bloat of solana_sdk
• Adds tests to check functionality of the precompile, as well as the computed curve order values

[buffalojoec]

I think I looked at just about everything except the actual cryptography. I saw @samkim-crypto self-requested review.

I spotted a handful of small nits, mostly around naming and semantics. Let me know what you think. Other than that nice work!

[0xRigel]

Thanks for another set of updates. The crypto parts should look good after these set up updates. Let's try to fix the CI issues and the conflicts to master. In the meanwhile, I just wanted to spend a day or two exploring other pure rust variants that we can potentially use. If none of them suffice, then let's just stick with openssl.

Got it, sounds good 👍 Reverted the new error and fixed the conflicts. I still have the p256 implementation from the first SIMD attempt and for purposes of benchmarking, so if you want to take a look at that just let me know.