Active transaction monitoring

[palango]

Currently transactions are send with given gas price and the hope that this will be enough to get them mined in time.

For the MS, where is is important to have the transaction mined in a certain interval it might be a good idea to actively manage transactions. This idea comes originally from the web3 library.

References

• Excessive traffic with sampling gas price strategies ethereum/web3.py#1066 (comment)
• Implementation for calling JSON RPC calls using asyncio, round-robin public nodes, and increasing gas prices ethereum/web3.py#1131