tmf: Do not define base aspects in the interface

tmf: Do not define base aspects in the interface

Instead, create a class with static getters for those aspects

This avoids initialization exceptions when adding a default method in the
interface

Change-Id: I490755e95dedaebaebd0439710c14077010907eb
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/71798
Reviewed-by: Hudson CI
Reviewed-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>