Add deprecation warning to `track_interactive` ahead of v0.5

[quantumjot]

track_interactive will be replaced by track in v0.5. We need to raise a deprecation warning ahead of making that big change as it will probably break a lot of peoples code!

We also need to provide a generator function for the tracking phase (with a yield) to enable napari-btrack to provide some feedback to the user (see related issue: https://github.com/lowe-lab-ucl/napari-btrack/issues/35)