Optional imports are imported

[StijnKas]

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Issue description

In the V4 version of pdstools, we are working with optional dependencies. Today, some of these optional dependencies like httpx and requests are automatically imported when you import any module from pdstools.

Reproducible example

from pdstools import ADMDatamart

Expected behavior

Since these are optional, they should not automatically load / be imported, instead, they should only be imported when one of the relevant modules is imported directly.

Installed versions

pdstools v4