Improve python interface

[MusicalNinjaDad]

• Breaking: Changed top level module name to fizzbuzz. Use from fizzbuzz.fizzbuzzo3 import fizzbuzz
  for rust implementation or from fizzbuzz.fizzbuzzpy import fizzbuzz for python implementation (slower).
• Added typing and docstring hints available in IDE

[sourcery-ai]

Hey @MusicalNinjaDad - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 2 issues found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good

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