Automated gas consumption test: token swap

[taokayan]

Depends on #305

Develop automated tests to verify the gas consumption are same across the following executors (including using the latest gas algorithm with custom gas parameters):

• executor in the evm-runtime contract
• executor in evm-node
• executor used in gas estimation via rpc
• executor in transaction trace
• executor in vmTrace

for the following transactions:

• swap contract deployment
• swap contract initialization
• 1st transfer tokens to swap contract (init funds for the swap pool)
• 2nd transfer tokens to swap contract (add funds to existing pool)
• token swap to new account (account that does not have ERC20 token balance)
• token swap to existing account (account that has ERC20 token balance)

use eth-brownie to help us with the setup of the contracts (uniswap pools, nft, etc) and also with the interaction with the EVM since all our integration tests are using python already.

also look into hardhat.config used in eos-evm-node and also scripts.

measure the executor in the evm-runtime contract by using the balance difference and the gas price