[FEATURE REQUEST] Command to check/cancel the node's pending txs

[0xfornax]

One of the frequent issues users face while using the smartnode is the friction we have today to locate and cancel/overwrite pending transactions. This involves searching etherscan to locate the last used nonce, and running the overwrite transaction, which requires a few parameters to be calculated by the users, leading to more errors (values at least 10% higher than the previous ones).

A new feature to show information about pending txs and allow users to request to cancel would be very interesting.