EVM e2e tests

[gztensor]

Currently here: https://github.com/gztensor/subtensor-js-tests

Tests:

• [x] Connection can be established
• [x] Block number can be read
• [x] Can deploy a smart contract
• [ ] Verification of ed25519 works
• [ ] Staking precompile: Can add stake
• [ ] Staking precompile: Staker receives rewards
• [ ] Staking precompile: Can remove stake
• [ ] Can remove stake: Can accrue staking rewards
• [x] Transfer from substrate to EVM
• [x] Transfer between two EVM accounts
• [x] Transfer from EVM to substrate using precompile
• [x] Transfer from EVM to substrate using evm::withdraw
• [x] Transfer value using evm::call
• [ ] Forward value in smart contract
• [ ] Transfer full balance
• [x] Transfer more than owned balance should fail
• [ ] Transfer more than u64::max in substrate equivalent should receive error response
• [x] Gas price should be 10 GWei
• [ ] max_fee_per_gas and max_priority_fee_per_gas do not affect transaction fee