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 75.70%. Comparing base (7e29be3) to head (65c71a9).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6616      +/-   ##
============================================
+ Coverage     75.68%   75.70%   +0.02%     
- Complexity     5754     5756       +2     
============================================
  Files           699      700       +1     
  Lines         19725    19738      +13     
  Branches       3826     3827       +1     
============================================
+ Hits          14929    14943      +14     
+ Misses         4216     4215       -1     
  Partials        580      580              

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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