EIP-7951 P256verify Precompiles

Documentation for tests/osaka/eip7951_p256verify_precompiles@88e9fb8f.

Generate fixtures for these test cases for Osaka with:

fill -v tests/osaka/eip7951_p256verify_precompiles --fork Osaka

Tests EIP-7951: Precompile for secp256r1 Curve Support.