C-KZG-4844: A minimal library for EIP-4844 Polynomial Commitments

This is a copy of C-KZG stripped down to support the Polynomial Commitments API:

• compute_aggregate_kzg_proof
• verify_aggregate_kzg_proof
• blob_to_kzg_commitment
• verify_kzg_proof

We also provide load_trusted_setup and free_trusted_setup to load the trusted setup data from a file into an object that can be passed to the API functions, and functions for converting commitments/proofs/points to/from bytes.

Install the blst submodule

git submodule update --init

Build blst

cd src
make blst

Build the C-KZG code

cd src
make