feat: add secp256r1 support

[DreamWuGit]

Description

This PR aims to support secp256r1(p256) precompile from circuit side.

• refactor struct SignData to generic type SignData<Fq, Affine>
• add p256 event to PrecompileEvents and provide method to get p256 signature data
• halo2-lib: update secp256r1 field(Fp, Fq) implement ScalarField.
• assign new p256 signature data into sig table
• sig circuit: refactor assign_ecdsa to support new secp256r1
• sig circuit: refactor sign_data_decomposition to support secp256r1
• sig circuit: refactor assign_sig_verify to support secp256r1
• halo2-lib: update is_on_curve_or_infinity applicable to secp256r1
• sig circuit: add p256 unit tests
• skip keccak lookup ?
• todo

Issue Link

[link issue here]

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update