Added a new Feature called Sudoku Solver by using Backtracking and Re…

[captiosus1]

Description:
Implemented a Sudoku solver that uses a backtracking approach to solve any valid Sudoku puzzle.
Added functionality to check if placing a number in a specific cell is valid, adhering to Sudoku's row, column, and sub-grid rules.
Includes a method to print the solved Sudoku board.
Added handling for unsolvable Sudoku cases, with a clear output indicating whether the puzzle can be solved.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 36 lines in your changes missing coverage. Please review.

Project coverage is 59.56%. Comparing base (6535d47) to head (b60338e).

Files with missing lines	Patch %	Lines
...a/com/thealgorithms/backtracking/SudokuSolver.java	0.00%	36 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5698      +/-   ##
============================================
- Coverage     59.72%   59.56%   -0.16%     
+ Complexity     3854     3853       -1     
============================================
  Files           560      561       +1     
  Lines         16011    16047      +36     
  Branches       3072     3085      +13     
============================================
- Hits           9563     9559       -4     
- Misses         6045     6083      +38     
- Partials        403      405       +2     

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