Using Delimiter enum values instead of hardcoded chars

[Invokedzz]

Description

This changes improves readability and avoids the use of hardcoded chars; making the code more maintainable.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test coverage improvement

Changes Made

• Add getValue() method in Delimiter.class to avoid the use of hardcoded characters in Decode

Testing

• All existing tests pass
• Added new tests for changes
• Tests cover edge cases and spec compliance

Pre-submission Checklist

• My code follows the project's coding standards
• I have run code formatting/linting tools
• I have added tests that prove my fix/feature works
• New and existing tests pass locally
• I have updated documentation if needed
• I have reviewed the TOON specification for relevant sections

Breaking Changes

• No breaking changes
• Breaking changes (describe migration path below)

[github-actions]

Code Coverage

Overall Project	99.05%	🍏
Files changed	100%	🍏

File	Coverage
DecodeHelper.java	100%	🍏
Delimiter.java	100%	🍏
TabularArrayDecoder.java	99.33%	🍏