feat: Add utilities for working with functions

[nielsenko]

Description

This PR introduces a set of functional programming utilities.

• A new file, lib/src/util/functional.dart, has been added, which includes extension methods for:
  • pipe: For chaining functions.
  • compose: For composing functions.
  • apply: For partial application of functions (supports 1 to 4 arguments).
  • pack: For converting functions that take multiple arguments into functions that take a single tuple argument (supports 1 to 4 arguments).
• These new functional utilities are exported through the main lib/relic.dart file for easier access.

Related Issues

• Closes: ?

Pre-Launch Checklist

Please ensure that your PR meets the following requirements before submitting:

• This update focuses on a single feature or bug fix. (For multiple fixes, please submit separate PRs.)
• I have read and followed the Dart Style Guide and formatted the code using dart format.
• I have referenced at least one issue this PR fixes or is related to.
• I have updated/added relevant documentation (doc comments with ///), ensuring consistency with existing project documentation.
• I have added new tests to verify the changes.
• All existing and new tests pass successfully.
• I have documented any breaking changes below.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 82.17%. Comparing base (8e79b2f) to head (c7f046c).

Files with missing lines	Patch %	Lines
lib/src/util/functional.dart	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
- Coverage   82.64%   82.17%   -0.48%     
==========================================
  Files          80       81       +1     
  Lines        2432     2446      +14     
  Branches     1361     1375      +14     
==========================================
  Hits         2010     2010              
- Misses        422      436      +14     

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