Fixes and updates for differential parmater sweep tool

[avdudchenko]

Fixes/Resolves:

This PR fixes differential parameter tool and updates it to comply with current ParamterSweep class usage

(1) Fixes issue with model re-initialization when solving differential sample, resulting in erroneous results
(2) Makes Diff tool compatiable with parallel manager useing MultiProcessing, ConcurrentFutures, and RayIO, ensures stable usage with MPI
(3) Refactors parallel functions, and moves them into parameter_sweep_parallel_utils.py to provide generalized functions for use with parameter sweep and differential sweep class

(replace this with the issue # fixed or resolved, if no issue exists then a brief statement of what this PR does)

Summary/Motivation:

Diff tool was essentially broken, this provides critical fixes and ensures compatibility with current parallel infrastructure.

Changes proposed in this PR:

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[bknueven]

What is going on that we need multiple inheritance here?

Is this just to separate the methods or does some other class need to just inherit from _ParameterSweepBase?

[avdudchenko]

its so both ParameterSweep and DifferentialParamterSweep class can get access to same underlying parallel functions.

I was thinking of just putting them into _ParamterSweepBase as well, but figured it would be clenaer to store all relevant parallel function in a single place.

We can also have _ParamterSweepBase inhert _ParameterSweepParallelUtils as ParatemterSweep and DifferntialParamterSweep inherit _ParamterSweepBase.

Ultimately, the underlying functions would need to move out of paramtersweep class and either into their own class or _ParmaterSweepBase. We can do what you think is better/cleaner.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (d2fb122) 94.30% compared to head (3c1c9bc) 94.24%.

Files	Patch %	Lines
...s/parameter_sweep/paramter_sweep_parallel_utils.py	94.56%	5 Missing ⚠️
...ls/parameter_sweep/parameter_sweep_differential.py	97.43%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1240      +/-   ##
==========================================
- Coverage   94.30%   94.24%   -0.07%     
==========================================
  Files         359      360       +1     
  Lines       36261    36284      +23     
==========================================
- Hits        34197    34195       -2     
- Misses       2064     2089      +25     

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[k1nshuk]

Looks good, except adding a warning for the debugging data dir.