initial risc0 support

[feltroidprime]

Notable changes :

• Adds a msm_g1_u128function in ec_ops.cairo where scalars are u128 instead of u256
• Adds u128_array_to_epns function to utils.cairo to compute the epns for a u128 array
• Adds a Groth16ProofRawstruct in groth16.cairo that holds only the A, B, C proof points.
• Adds utils for computing public inputs from risc0 inputs in risc0_utils.cairo
• Adds the msm_g1_u128 endpoint to the universal ECIP contract
• Supports risc0 proof parsing from jsons in the following format (taken from https://github.com/risc0/risc0-ethereum/blob/main/contracts/test/TestReceipt.sol )

  {
  "seal": "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",
  "image_id": "0xd01c15afa768a05b213a9e5fcdcc5724a2947e00098c7ec34ccbe2946bbc0013",
  "journal": "0x6a75737420612073696d706c652072656365697074"
  }

• Adds risc0 contract generator parametrized by RISC0 constant's CONTROL ROOT and BN254_CONTROL_ID, with defaults taken from https://github.com/risc0/risc0-ethereum/blob/main/contracts/src/groth16/ControlID.sol and hardcoded in parsing_utils.py
• Added test for this contract in the CI on local devnet.
• Support calldata serialization for MSM and groth16 for risc0 proof (auto-detected if proof python class was initialized from the json format above)
• Deployed a contract on testnet here https://sepolia.starkscan.co/contract/0x05bfc138c9b760df27f1ce8e4e448c1f3d223a37ecf2ef0597830e9f1da7e3e7#overview
• With a tx there https://sepolia.starkscan.co/tx/0x01176fa3693a0730015a1910659fe8e4fc2785c78630bea82b47c8f987dbe179#overview

Steps to reproduce were :

garaga declare-project --project-path src/contracts/risc0_verifier_bn254/
garaga deploy-project --class-hash 0x52d612ee6d728b925843adbb0744c72207bd78d84dffb5a0e61140a1783f208
garaga verify-onchain --system groth16 --contract-address 0x5bfc138c9b760df27f1ce8e4e448c1f3d223a37ecf2ef0597830e9f1da7e3e7 --vk hydra/garaga/starknet/groth16_contract_generator/examples/vk_risc0.json --proof hydra/garaga/starknet/groth16_contract_generator/examples/proof_risc0.json