Improve support for transactions with value on send-tx

[nventuro]

Currently, the only way to append value to a function call done via send-tx is with the --value flag. On interactive mode, we should detect if the selected function is payable, and if so prompt a value input.

Additionally, we should include the value on the 'calling function foo with arguments a, b, c' message.

[kamescg]

Did this ever get added?

[frangio]

@kamescg No, we haven't implemented this yet and it has very low priority for us.