Support for Doxygen @include{doc} command

[llarose]

Breathe fails to process <file-name> argument of doxygen command \include{doc} .

Doxygen settings set on both exhale_args and Doxyfile

EXAMPLE_PATH  = <path leading to folder of file_to_be_included, if relative path is used>
EXAMPLE_RECURSIVE = YES #optional. 

/**
* @brief example
* @include{doc} <absolute_path to rule out relative path issues>/file_to_be_included
*/
class example()
{}

• Doxygen 1.9.6 successfully include the file_to_be_included in the generated documentation block.
• Breathe fails to process the included documentation block in the directive:

.. doxygenclass:: example
    :members:

I can provide a more detail description and prehaps some runnable code if necessary.