aspectran / aspectran / #4773

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feat: Introduce AponParser for efficient dynamic APON parsing

This commit introduces a new `AponParser` class designed for efficient and intuitive parsing of APON documents, particularly for dynamic data structures and multi-dimensional arrays.

- **Structure-based Parsing:** Implements a recursive, structure-based parsing mechanism that directly builds nested `List` objects for arrays, offering improved performance and clarity over `AponReader` for these scenarios.
- **Comprehensive Scalar Handling:** Supports parsing of various scalar types including strings (quoted/unquoted, escaped), numbers (int, long, double), booleans, and nulls.
- **Text Block Support:** Adds functionality to correctly parse multi-line text blocks defined within `()`.
- **Empty Structure Handling:** Properly parses empty object blocks `{}` and empty arrays `[]`.
- **Robust Error Handling:** Includes detailed error reporting for unclosed structures, invalid line formats, and malformed escape sequences.
- **Dedicated Test Suite:** Accompanied by `AponParserTest.java` with comprehensive test cases verifying all new functionalities.

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