Create a notebook describing parameter sweeps

[dabacon]

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[MichaelBroughton]

Looks good. Do we not have something already that explains the run_sweep, run_batch and run behaviors that we might be able to roll this into ? @augustehirth

[augustehirth]

We teach run_sweep in https://quantumai.google/cirq/simulation#parameterized_values_and_studies and https://quantumai.google/cirq/tutorials/basics#using_parameter_sweeps.

Run_batch is introduced in https://quantumai.google/cirq/google/engine#running_circuits_in_batch, which is an out-of-order QCS doc.

I think the detail presented in Dave's tutorial here is great and we would have to get rid of a lot of that if we were to merge it into somewhere else. This also gives us a place to write more functionality related to parameter sweeps if added in the future, like flattening was done recently.

However, I think the idea to have run behaviors in one place is a good idea, as long as it is applicable to all or most means of running/simulating (instead of just QCS). Do you think it would be suitable to add run_batch to this doc?

[dabacon]

Updated per review comments, ready for re-review.

[augustehirth]

lgtm, thanks for all the updates