added treap class

[ShreeHarish]

• 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 54.40000% with 57 lines in your changes missing coverage. Please review.

Project coverage is 52.98%. Comparing base (be8df21) to head (89a4d39).

Files with missing lines	Patch %	Lines
.../com/thealgorithms/datastructures/trees/Treap.java	54.40%	55 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5553      +/-   ##
============================================
+ Coverage     52.95%   52.98%   +0.03%     
- Complexity     3309     3331      +22     
============================================
  Files           529      530       +1     
  Lines         15343    15468     +125     
  Branches       2925     2939      +14     
============================================
+ Hits           8125     8196      +71     
- Misses         6882     6936      +54     
  Partials        336      336              

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