refactor: add const to generated constructors

[RahmiTufanoglu]

What does this change?

Adds const to the private constructors generated by the colors and fonts generators.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

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• Make sure to open a GitHub issue as a bug/feature request before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
  • Ensure the tests (melos run test)
  • Ensure the analyzer and formatter pass (melos run format to automatically apply formatting)
• Appropriate docs were updated (if necessary)

[AlexV525]

Hi, I think we can directly move on to abstract final class rather than the improving these old styles. WDYT?

[RahmiTufanoglu]

Hi, I think we can directly move on to abstract final class rather than the improving these old styles. WDYT?

You are right. We should use the new dart coding styles. I will update.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.37%. Comparing base (328547b) to head (8aadb3b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #755      +/-   ##
==========================================
- Coverage   97.37%   97.37%   -0.01%     
==========================================
  Files          24       24              
  Lines         991      989       -2     
==========================================
- Hits          965      963       -2     
  Misses         26       26              

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