script: add more postchecks

[TuDo1403]

Description

This PR adds new post checks:

• Proposal:
  • [BridgeManager]: fails if non-governor vote on proposal
  • [BridgeManager]: fails if non-governor create proposal
  • [BridgeManager]: fails if insufficient signature when relay proposal
• Quorum Config:
  • [BridgeManager] total weight >= 300.
  • [BridgeManager] require valid thresholds.
  • [BridgeManager] operator weight must be strictly 100 for both chains.
  • [Gateway] minimum vote weight != 0.
  • [Gateway] require valid thresholds.
• Deposit/Withdraw:
  • [Gateway]: WETH address unchanged on ethereum.
  • [Gateway]: Deposit ETH on Ethereum.
  • [Gateway]: Deposit WETH on Ethereum.
  • [Gateway]: Deposit ETH fails if sent insuficient value compared to info.quantity.
  • [Gateway]: Withdraw ERC20 fails if the number of signature is less than the threshold.
  • [Gateway]: Deposit ERC20 fails if the number of signature is less than the threshold.
  • [Gateway]: Withdraw ERC20 fails if submitted duplicated signatures.
  • [Gateway]: Withdraw ERC20 fails if submitted unsorted signatures.

Checklist

• I have clearly commented on all the main functions following the NatSpec Format
• The box that allows repo maintainers to update this PR is checked
• I tested locally to make sure this feature/fix works

[nxqbao]

LGTM