Implement a status model

[efcy]

The status model should track the number of frames for a certain representation. Replacing the existing tracked frame counts in the log model:

num_cognition_frames = models.IntegerField(blank=True, null=True)
num_motion_frames = models.IntegerField(blank=True, null=True)
num_jpg_bottom = models.IntegerField(blank=True, null=True)
num_jpg_top = models.IntegerField(blank=True, null=True)
num_bottom = models.IntegerField(blank=True, null=True)
num_top = models.IntegerField(blank=True, null=True)

For each representation we want to input we need to track if we already have inserted that in the database.