Show alert on confirmations with high network congestion and volatile gas estimations

[rachelcope]

#Description
As a user, I want to be notified if there is high network congestion and gas estimations are currently volatile

#Situation
GIVEN: I am confirming a transaction (transaction confirmation, approve, etc)
WHEN: when there is high network congestion and gas estimations are volatile
THEN: I should get an alert notifying me of high gas prices

Error use cases