gnosis / dex-services / 5354

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travis-pro

Add more fine grained gas price estimation method (#1493)

In preparation for using more advanced gas estimation this commit adds a
new method to the trait which estimates gas price based on the
transaction's gas use and time limit.

After this is merged I want to implement the trait for other "gas stations" than the gnosis one.

### Test Plan
Ci. New function is not used anywhere.

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