[WIP] Simulate / Estimate Fees for a set of operations

[keefertaylor]

Addresses #171

[codecov]

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[simonmcl]

This looks great. I think you need to expose a FeeEstimator instance from TezosNodeClient so this estimate: [] method can be called without having to instantiate a simulation service and a network client etc. as they are all internal too.

I can't test it properly as I need too much code from my other "orignate_smart-contract" branch

This would be useful as for all of my use cases i've had to stop using the action methods like tezosNodeClient.send(amount: ....) and rely on arrays of operations for everything so I can display confirmation screens. After this it would become much simpler to do

// Generate operations array from tezosNodeClient.operationFactory()
// Estimate fees from tezosNodeClient.feeEstimator.estimate( [operations] ) and update screen when done
// On confirm, send with tezosNodeClient.send( [operations] )