Add `babeltrace.` prefix to `trace-info` and `support-info` query objects

Add `babeltrace.` prefix to `trace-info` and `support-info` query objects

The `trace-info` and `support-info` query objects are supported by the
project's plugins, the project's Python bindings, and the project's CLI.
To avoid name clashes with third-party query objects, prepend
`babeltrace.` to the object names as a namespace.

The dot notation is not standardized in any way here: it is an arbitrary
format that the project chooses. We don't necessarily expect third-party
developers to follow this scheme.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Change-Id: I6aec9bf24f7a8a41796c3a1e84d982c99be6aee5
Reviewed-on: https://review.lttng.org/c/babeltrace/+/1783
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-by: Simon Marchi <simon.marchi@efficios.com>