Initialize Ball and Sticks

[zachcp]

To get ball and stick working I needed to:

Implement bond detection.

pdbtbx parses atom info but does not calculate bonds. I created the connect_via_residue_names function which will iterate through residues and add bonds based on the CCD table. This is taken directly from biotite. Note Biotite also has a more rigorous methods that relies on distances.

Update Bevy Code

• iterate through spheres and create circles
• iterate through bonds and create cylinders for lines.