refactor(processor): Add missing actor classes import

Author: gfieni

src/powerapi/processor/__init__.py

@@ -26,3 +26,5 @@
 # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+from powerapi.processor.processor_actor import ProcessorActor, ProcessorState