WEB3-67: feat: switch Steel to alloy

[Wollac]

⚡️ Features

• Replace ethers dependency completely with alloy.
• Make host functions async.
• Add support to build EvmEnv from any alloy provider.
• Add more efficient RLP-based serialization for the header.

🛠 Fixes

• Store the commitment inside the EvmEnv.
• Use eth_getTransactionCount and eth_getBalance instead of eth_getProof to query basic account information.
• Switch tests from pre-recorded RPC responses to Anvil.

🚨 Breaking Changes

• EthEvmEnv::from_rpc now accepts a Url instead of a &str for the HTTP RPC endpoint.
• EvmEnv::from_provider now requires an alloy provider, and the block number parameter has been changed to a BlockNumberOrTag.
• EvmEnv::sol_commitment has been replaced with EvmEnv::commitment (to get a reference), or EvmEnv::into_commitment (to consume and return the commitment).
• ETH_SEPOLIA_CHAIN_SPEC and ETH_MAINNET_CHAIN_SPEC have been moved to the ethereum module.
• CachedProvider has been removed completely. As alternatives, you can:
  • Use anvil --fork-url https://ethereum-rpc.publicnode.com@20475759 to create a cached fork for block 20475759.
  • Cache the RPC responses on an HTTP level using Tower or a caching forward proxy.
• The host functions are now async instead of blocking:

  
  // Create an EVM environment from an RPC endpoint and a block number or tag.
  let mut env = EthEvmEnv::from_rpc(args.rpc_url, BlockNumberOrTag::Latest).await?;
  //  The `with_chain_spec` method is used to specify the chain configuration.
  env = env.with_chain_spec(&ETH_SEPOLIA_CHAIN_SPEC);

// Preflight the call to prepare the input that is required to execute the function in // the guest without RPC access. It also returns the result of the call. let mut contract = Contract::preflight(CONTRACT, &mut env); let returns = contract.call_builder(&CALL).from(CALLER).call().await?;

// Finally, construct the input from the environment. let input = env.into_input().await?;