Refactor holidays

[laendoor]

I'll create a clear PR description based on the git diff, using Markdown formatting.

PR Description

Changes

• Refactored holidays functionality with improved code organization and testing

  • Created new Holidays-v2 class with cleaner API and better separation of concerns
  • Added new HolidaysController to handle holiday-related Telegram commands
  • Implemented helper functions in separate helpers.ts file for better code reusability

• Added comprehensive test coverage for holidays functionality

  • Added fixture files for Argentina and Canada holiday data
  • Created unit tests for helper functions, holidays controller, and core functionality
  • Improved test organization and readability

• Updated development configuration

  • Removed .tool-versions in favor of Volta for Node.js version management
  • Added Volta configuration (Node.js 20.10.0, Yarn 1.22.22)
  • Updated VS Code settings for Markdown linting

• Added Codacy badges to README for code quality and coverage tracking

Technical Details

• Created new types for holiday-related data structures
• Improved error handling and date manipulation
• Added proper TypeScript types throughout the codebase
• Implemented consistent date formatting and calculations
• Added support for ISO date strings in holiday information

Testing

• Added test fixtures for Argentina and Canada holiday data (2023-2024)
• Created unit tests for:
  • Markdown escaping functionality
  • Date formatting and calculations
  • Holiday data fetching and processing
  • Long weekend calculations

The changes improve code maintainability, testability, and provide better type safety while maintaining existing functionality.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +20.93% (target: -1.00%)	✅ 98.11%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (716a6c6)	203	121	59.61%
Head commit (57d2629)	185 (-18)	149 (+28)	80.54% (+20.93%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#45)	53	52	98.11%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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