Relicense Tempo datasource plugin to Apache 2 (#55866)
Relicense Tempo datasource plugin to Apache 2 (#55866)

As per Ash's request.

Signed-off-by: Richard Hartmann <dbc5c9b9cbc722d5250b7cedc577ded204477545@richih.org>
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana