feat: add separate_packages option

Adds the ability to separate packages within a section with blank lines.
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Co-authored-by: Lucas <lucas.bremond@gmail.com>

chore: make python3.8-compatible (#2)

chore: use python 3.8-style typing

ci: ignore PY-R1000

refactor: breakout function, add examples (#4)

* Revert "ci: ignore PY-R1000"

* refactor: breakout logic into separate function

* docs: add examples

chore: remove py3.8 types

style: fix format

style: fix formatting