[20274] Feature/yaml validator v2

[David-LP99]

Added a JSON-schema-based YAML validator to Fast DDS Spy for to ensure the configuration files follow the expected structure.

Configuration files are now validated against a dedicated JSON schema before being loaded, empty YAML files are accepted as a valid way of using the default configuration.

Also added a comprehensive set of tests for the validator (covering both valid and invalid configuration files), and updated the existing Yaml Reader tests and documentation/resources affected by these changes.

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.06%. Comparing base (1c51730) to head (3ce4bed).

Files with missing lines	Patch %	Lines
...astddsspy_yaml/src/cpp/YamlReaderConfiguration.cpp	25.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #153      +/-   ##
==========================================
- Coverage   62.82%   58.06%   -4.76%     
==========================================
  Files          29       28       -1     
  Lines        2480     1934     -546     
  Branches     1068      770     -298     
==========================================
- Hits         1558     1123     -435     
+ Misses        363      325      -38     
+ Partials      559      486      -73     

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