[Feature Request] Support amount in payee_patterns for ECImporter

[momu]

Another nice to have option would be a third optional argument for the payee_patterns: the amount.
I've multiple transactions from the same person, but they differ in description and amount.

Evaluating the description_pattern introduced in #108 works in this case also. But it would be easier in some cases with repeating transactions to differentiate the transactions by the transaction amount.

[siddhantgoel]

Is there an example case you have in mind where matching the amount would be easy but matching the description would not work or would be difficult?