Add NonPreemptivePriorityScheduling new algorithm with unit tests

[Hardvan]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.73684% with 2 lines in your changes missing coverage. Please review.

Project coverage is 64.22%. Comparing base (c301fec) to head (c574498).

Files with missing lines	Patch %	Lines
...ms/scheduling/NonPreemptivePriorityScheduling.java	94.73%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5535      +/-   ##
============================================
+ Coverage     64.13%   64.22%   +0.08%     
- Complexity     4205     4217      +12     
============================================
  Files           587      588       +1     
  Lines         16388    16426      +38     
  Branches       3163     3170       +7     
============================================
+ Hits          10511    10549      +38     
  Misses         5448     5448              
  Partials        429      429              

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[Hardvan]

I have added the startTime attribute to the scheduling code and modified the Junit tests to reflect the same.

[Hardvan]

I added another variable called arrivalTime to keep track of this.

[Hardvan]

I have added a waitingQueue variable to address the above change.