Contributes to #2481

This is a partial fix, to implement parser location, for better yaml error messages.

Changes

Please provide a brief description of the changes here.

• Implement the "Location" of a yaml node in the parser

  • Make all document nodes point to the document root
  • Make the document root own the yaml parser that is used to create the document
  • Inspect a node location by following the links up to the document root, and then invoke the rapidyaml parser.

• Implement a location property in yaml related exceptions

• Change all the parsing code to pass the current yaml node as context, in case code needs to access a node location to raise an exception.

With all these changes, when the parser fails with an invalid schema exception, the exception contains:

• the name of the yaml input file used
• the line number, column number, and offset from the document start, where the error was detected.

This helps ease of use, so error messages about invalid config.yaml files point precisely at the error location.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed