feat: add DDA line drawing algorithm

[saahilmahato]

• 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

This PR adds implementation of the Digital Differential Analyzer line drawing algorithm, along with unit tests.

Changes include:

DDALine.java — implements the algorithm.
DDALineTest.java — JUnit tests with 100% coverage for the implementation.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.83%. Comparing base (6b7d201) to head (7359b2e).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6616   +/-   ##
=========================================
  Coverage     77.82%   77.83%           
- Complexity     6392     6393    +1     
=========================================
  Files           732      733    +1     
  Lines         21320    21333   +13     
  Branches       4182     4183    +1     
=========================================
+ Hits          16592    16604   +12     
  Misses         4059     4059           
- Partials        669      670    +1     

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[saahilmahato]

Hi @alxkm , this PR seems to have gone unnoticed. I would appreciate it if you could review it when you have time. Thanks. 😄

[DenizAltunkapan]

Looks good, thanks! @saahilmahato