mshumko/aurora-asi-lib: Maturing the Conjunction API

This patch release is the first in a few that are focused on maturing the asilib.Conjunction()' API. Compared theasilib.Imager()` API, the Conjunction API still feels a little clucky.

Changed the asilib.Conjunction API so that the satellite ephemeris is provided with one argument: either a tuple of two np.ndarray, or a pd.Dataframe. The mapping and other transformations are applied to the internal asilib.Conjunction.sat attribute

Changed the asilib.Conjunction.lla2azel to asilib.Conjunction.map_azel and changed how the nearest pixel indices are calculated. Before, the nearest pixel was calculated using a Euclidean distance and now it uses the more accurate and vectorized Haversine formula.

Added tests for the following three asilib.Conjunction methods:

1. find(),
2. interp_sat(), and
3. map_azel().