gstinfo: Allow passing a string identifier for debugging

gstinfo: Allow passing a string identifier for debugging

This adds "id" variants to most debugging functions, and allows providing a
string identifier instead of a GObject.

This allows providing unified and clearer debug logs for all the
non-gobject-based items, and opens the way for more unified logging.

As an extension, copying the object name is avoided as much as possible, by
using it directly instead of going through another copy.

* API : gst_debug_message_get_object_id

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3483>