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Refactor: Introduced new Sprintf formatter with enhanced placeholder logic

- Rewrote `Sprintf` to support an advanced formatting system.
- Improved placeholder parsing:
  - Added support for mixed auto-indexed `{}` and explicit numeric `{n}` placeholders.
  - Enhanced fallback behavior for named placeholders `{key?fallback}`.
  - Added chaining for complex modifiers like `{key.$trim.$replace(a,b).$upper}`.
- Introduced escape sequences for `{}` to print literal curly braces (`\{` and `\}`).
- Updated logic to synchronize auto-indexing with explicit numeric placeholders.
- Extended modifier support, including `$substring`, `$truncate`, `$round`, `$abs`, `$reverse`, and more.
- Improved robustness to handle edge cases and invalid placeholders gracefully.
- Updated tests to include:
  - Comprehensive scenarios for modifiers, fallback, and chained logic.
  - Edge cases like missing keys, unsupported modifiers, and malformed input.
- Enhanced documentation for `Sprintf`, highlighting new features, examples, and usage tips.

This refactor significantly improves the flexibility and usability of the formatting logic, making it more powerful and extensible.

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