Document Required compiled-into-python support components

> [!NOTE]
> Migrated from [augurlabs/augur#3352](https://github.com/augurlabs/augur/issues/3352)
> Originally opened by `@MoralCode` on 2025-10-28

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Since getting started with augur this is now the second time i've run into an issue where the fix was "you need to have these development headers for this thing present when you install and/or compile python for python to support "

This issue aims to loosely document those while various refactoring and digging into old parts of the code happens so it can later be turned into docs.

1. ffi (`No module named '_ctypes'`) https://www.geeksforgeeks.org/python/how-to-fix-modulenotfounderror-no-module-named-ctypes/
2. https://stackoverflow.com/a/53698659/3033386 (bz2 support, found while trying to run the metrics unit tests) - its `bzip2-devel` on fedora