feat: add support for formatting album release dates

This update introduces support for handling date-related format strings, improving the flexibility of media metadata formatting.

- ✨ **Feature**: Adds `_format_dates` function to handle date-related strings like `album_date`.
- 🛠️ **Enhancement**: Refactors `_format_durations` by isolating date-related logic into a new function.
- 📅 **Improvement**: Supports formatting `album_year` and `album_date` with proper checks for `Album` and `Track` types.

This improvement enhances media metadata formatting capabilities for more detailed date information.

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