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 54.61%. Comparing base (07cb6c4) to head (59d8874).

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    #5563    +/-   ##
==========================================
  Coverage     54.60%   54.61%            
- Complexity     3417     3438    +21     
==========================================
  Files           536      537     +1     
  Lines         15406    15531   +125     
  Branches       2937     2951    +14     
==========================================
+ Hits           8413     8482    +69     
- Misses         6638     6693    +55     
- Partials        355      356     +1     

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[siriak]

Looks good, thanks!

[ShreeHarish]

Thanks, nice working on the repo