Add capabilities to parallel_floris_model

[paulf81]

#Add capabilities to parallel_floris_model

This pull request adds some capabilities to ParallelFlorisModel. These updates are not comprehensive, a more thorough updating of ParallelFlorisModel to provide full functionality of FlorisModel is deferred to a future pull request. The updates included in this PR are those necessary to support capabilities in FLASC's use of parallelized FLORIS runs. Specifically:

• The set function's inputs are expanded to match the full set in FlorisModel
• The method to run without wake (no_wake = True) is updated to the correct syntax of underlying FlorisModel
• A new test of running without wake is added to confirm correct behavior
• Functions for getting and setting operation model added
• Functions for getting and setting parameters are added

A few remaining open questions:

1. Some #TODO in the code mark a question (@misi9170 ) if a re-run of init is necessary / appropriate?
   (UPDATE: we decided to include init to be safe/consistent)
   Not doing this:
   3. I believe one more improvement we could make is add default values to max_workers, for example I think something like this code:

    ```
     if max_workers is None:
          max_workers = multiprocessing.cpu_count()
    ```
    
    Or maybe this can be out of scope of this PR
   

Impacted areas of the software

parallel_floris_model.py