gdir, gstrvbuilder: Add refcounting support and a boxed type

Philip Withnallrequested to merge
pwithnall/glib:migrate-to-gi-docgen12 into main

This allows the methods for GDir and GStrvBuilder to be introspected. While we don’t expect languages which use the introspection bindings to use either of them, full introspection support is necessary for the documentation to be correctly built with gi-docgen.

Signed-off-by: Philip Withnall pwithnall@gnome.org

Helps: #3037 (closed)

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