YAML support

[kunitoki]

This pull request introduces a new YAML parsing and writing feature to the core library, adds supporting documentation, and includes minor enhancements to character handling utilities. The main addition is the YAML class, which provides a comprehensive, self-contained YAML <-> var converter with support for common YAML features, and integrates it into the core API and documentation. Additionally, new character utility methods are added to improve ASCII and control character detection, and a small improvement is made to JSON formatting.

YAML Support and API Integration:

• Added a new YAML class in yup_YAML.h and implementation, providing static methods for parsing and writing YAML to and from var objects, with support for core-schema type resolution, block/flow collections, block scalars, anchors/aliases/merge keys, and formatting options (parse, fromString, toString, writeToStream, FormatOptions).
• Integrated the new YAML API into the core library headers and build (yup_core.h, yup_core.cpp) and test infrastructure (tests/yup_core.cpp). [1] [2] [3]

Documentation:

• Documented the new YAML class and its API in docs/core/data-interchange.md, including usage examples and feature notes.
• Added a changelog entry highlighting the new YAML support.

Character Utilities:

• Added new methods to CharacterFunctions: isAsciiPrintable and isControlCharacter, and used isAsciiPrintable to improve ASCII output in the JSON formatter. [1] [2] [3]

Build/Include Improvements:

• Included additional standard headers (<charconv>, <limits>) to support the new YAML parser implementation.

These changes collectively add robust YAML support to the library, improve interoperability, and enhance character handling for serialization and parsing tasks.

[codecov]

Codecov Report

❌ Patch coverage is 87.22359% with 156 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.60%. Comparing base (a2620ed) to head (451ead0).

Files with missing lines	Patch %	Lines
modules/yup_core/yaml/yup_YAML.cpp	87.08%	156 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
+ Coverage   80.47%   80.60%   +0.12%     
==========================================
  Files         775      777       +2     
  Lines       79059    80278    +1219     
==========================================
+ Hits        63623    64705    +1082     
- Misses      15436    15573     +137     

Files with missing lines	Coverage Δ
modules/yup_core/javascript/yup_JSON.cpp	94.32% <100.00%> (+3.87%)	⬆️
modules/yup_core/text/yup_CharacterFunctions.cpp	100.00% <100.00%> (ø)
modules/yup_core/text/yup_CharacterFunctions.h	98.74% <ø> (ø)
modules/yup_core/yaml/yup_YAML.h	100.00% <100.00%> (ø)
modules/yup_core/yup_core.cpp	100.00% <ø> (ø)
modules/yup_core/yaml/yup_YAML.cpp	87.08% <87.08%> (ø)

... and 3 files with indirect coverage changes

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