Enable BLS precompiles to support sharding/rollup

[khoau2u]

Abstraction
Following EIP-2537, apply on U2U to allow efficient on-chain BLS operations.
Aggregated signatures will allow for bundles or rollups or even shardings.

Motivation
Along with the curve arithmetic, multiexponentiation operations are included to efficiently aggregate public keys or individual signer’s signatures during BLS signature verification.

Constants to enabled
Codebase already included those precompiles and related libraries currently but only enabled for testing.

• BLS12_G1ADD
• BLS12_G1MUL
• BLS12_G1MSM
• BLS12_G2ADD
• BLS12_G2MUL
• BLS12_G2MSM
• BLS12_PAIRING_CHECK
• BLS12_MAP_FP_TO_G1
• BLS12_MAP_FP2_TO_G2

ABI for operations can be viewed in the eip-2537 link.