feature: Add option to filter out imported objects (true by default for backward compatibility)

[pawamoy]

Is your feature request related to a problem? Please describe.

Not really, it's rather a refactoring issue. Currently the templates use filter_objects first, then do a second pass with {% if members_list is not none or attribute.is_public %}. The next version will use Griffe 0.47's is_imported (negated) instead, but that makes it hard to follow. We should move this logic into the filter_objects filter, with a config option like show_imported_objects or similar name.

Describe the solution you'd like

New config option passed to filter_objects to decide whether to filter out imported objects or not.

Describe alternatives you've considered

/

Additional context

mkdocstrings/griffe#294

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[pawamoy]

Related to #78. I believe both issues could be handled at once.