Support direction (or "['dir']") optional attribute of Doxygen \param

Feature requested on Visual Studio at https://developercommunity.visualstudio.com/t/support-dir-optional-attribute-of-doxygen-param/1112281

Feature details:
This is a feature request to support parsing of the direction (or ‘[‘dir’]’) optional attribute of the Doxygen command \param '[‘dir’]'

Information about the direction or “dir” attribute:
https://www.doxygen.nl/manual/commands.html#cmdparam

Example:

/*!
 * Copies bytes from a source memory area to a destination memory area,
 * where both areas may not overlap.
 * @param[out] dest The memory area to copy to.
 * @param[in]  src  The memory area to copy from.
 * @param[in]  n    The number of bytes to copy
 */
void memcpy(void *dest, const void *src, size_t n);

If ‘[‘dir’]’ is supported, the hover info of the memcpy would show which param are [in] and which are [out].

Beginne damit, die Verarbeitung von Doxygen \param und den Hover-Info-Pfad in der C/C++-Erweiterung zu lokalisieren. Verwende das bereitgestellte Beispiel für [in] und [out], um das angeforderte Richtungsattribut nachzuverfolgen; abgeschlossen ist die Aufgabe, wenn die Hover-Info die Richtung jedes Parameters angibt.