Averaging slight adjustement for ensured thread safety

[nbollis]

In theory, the previous code was thread safe. However, additional steps were taken to ensure thread safety.

• Import System.Collections.Concurrent for concurrent collections.
• Change averagedPeaks from List to ConcurrentBag for thread safety.
• Move binIncidences array creation outside parallel loop to avoid redundancy.
• Modify Parallel.ForEach loop to use array length instead of list count.
• Remove lock around averagedPeaks.Add as ConcurrentBag is thread-safe.
• Reduced test project folders by moving the averaging test data into the averaging test folder

Benchmarked on a single top-down file
Old Time: 255s
New Time: 197 s

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.21%. Comparing base (6411360) to head (3bfed73).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #810      +/-   ##
==========================================
- Coverage   77.21%   77.21%   -0.01%     
==========================================
  Files         218      218              
  Lines       32966    32964       -2     
  Branches     3413     3413              
==========================================
- Hits        25455    25453       -2     
  Misses       6944     6944              
  Partials      567      567              

Files with missing lines	Coverage Δ
...b/SpectralAveraging/Algorithms/SpectraAveraging.cs	98.59% <100.00%> (-0.04%)	⬇️
...ctralAveraging/Util/SpectralAveragingParameters.cs	100.00% <100.00%> (ø)