Implement TUNA in mlos_bench

[bpkroth]

Placeholder issue to track to implementing the TUNA noisy optimization algorithm in an mlos_bench scheduler now that the TrialRunner abstraction is available (arxiv citation to be added).

May also want to finish implementing a basic ParallelTrialScheduler first (#380).

Probably also need to finish making some singleton VM ARM templates to make use of that (e.g., parameterized by the $trial_runner_id).

@jsfreischuetz for awareness and tracking