Initializes Jakarta Faces if at least one of the following conditions is met:
The Set of classes passed to this initializer contains an user-defined Faces type, or
FacesServlet has been explicitly mapped ,or
/WEB-INF/faces-config.xml exists
If it is met, and the FacesServlet has not been explicitly mapped,
then add mappings *.xhtml, /faces, *.jsf, and *.faces for the FacesServlet.