Improve gas estimation logic for eth_estimateGas

[m-Peter]

Closes: #663

Description

Instead of simply adding some buffer gas to the gas consumed returned by dry-running an EVM transaction, we now use that value as a starting point, and perform a binary search for the minimum required gas for successfully running an EVM transaction. In the context of gas estimation, successful means to not fail with a out of gas execution error.
The binary search approach, is largely inspired from https://github.com/onflow/go-ethereum/blob/master/eth/gasestimator/gasestimator.go#L49-L192, and adapter to our use-case.

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[peterargue]

is this algorithm copied from geth? if so, can you add a link or mention where it's from?

[m-Peter]

Yes, the algorithmic approach is copied over from Geth, with some necessary tweaks to fit our use-case.
Added the note in: affe39d .

[janezpodhostnik]

It would be interesting to see a metric of how many iterations we make on average to get the passingGasLimit maybe something we can add in the future.

[m-Peter]

That's a good idea 👍