Discuss Monitoring Services priority enforcement #58

As discussed in
#46 (comment)
and mentioned in:
#54 (comment), #54 (comment), #54 (comment)

We need to specify how Monitoring Services are prioritized when they will try to send the participants' balance proofs to the smart contract. The scope is to avoid them spamming the chain and losing gas on failed transactions.

We need rules to queue them and decide on how to enforce these rules

• in the Raiden client
• on-chain, in the Monitoring Service smart contract