Added Sentinel Linear Search .

[Th-Shivam]

• 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

❌ Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 75.77%. Comparing base (9484c7e) to head (ab2ea61).

Files with missing lines	Patch %	Lines
...m/thealgorithms/searches/SentinelLinearSearch.java	95.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6671      +/-   ##
============================================
+ Coverage     75.75%   75.77%   +0.01%     
- Complexity     5772     5783      +11     
============================================
  Files           703      704       +1     
  Lines         19777    19797      +20     
  Branches       3832     3837       +5     
============================================
+ Hits          14982    15001      +19     
  Misses         4215     4215              
- Partials        580      581       +1     

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[Th-Shivam]

@arindam89 @BurkHufnagel @Shisoik Sir please review my pull request as per your earliest convenience and merge it , and in case if there are any improvements needed then please let me know .