* adds new API methods to `web3.flashbots`:
- `get_bundle_stats`
- `get_user_stats`
- `send_private_transaction`
- `cancel_private_transaction`
* fixes goerli middleware bug
* `FlashbotsTransactionResponse` becomes `FlashbotsBundleResponse`, and `FlashbotsPrivateTransactionResponse` is added
- `sign_bundle` and `send_bundle` are affected
* adds EIP-1559 compatibility
* corrects typos & formatting errors
* upgrades dependencies
* adds missing type hints