Add static typing with Python type annotations #35
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This PR adds static typing for almost all functions in tracepy. A few functions, like glass_index, need fixing before static typing is added. I also moved many of the constants used in the code to a new constants.py file, and added a new exception "InvalidGeometry" for invalid geometry inputs given by a user. The gen_rot function was moved to utils.py to remove a circular import. Lastly, I broke up the transform.py functions to allow for static typing, since having two different return types was causing an issue.