Athena Caesura

## Description One of our scientists recently asked "what’s is the way to get a constant term from the PauliSum?" Currently the only way to do that is to iterate...

Our scientists would like a quick and intuitive way to access IBM's compiler. So we should have a function `ibm_compiler` that makes this a simple one step process. The function...

To combine results from different estimations of `ExpectationValues` we should be able to combine them! We are unsure if it's possible to add some of the properties of `ExpecationValues` together...

To better implement ZNE, we would like to have access to the precision of our `ExpectationValues`. So we should add a `precision` property to the `ExpectationValues` class and update `calculate_exact_expectation_values`...