Turned ManifestComponents into dataclasses

IngestionManifest has not been turned into a dataclass since its __init__() method has logic in it.

ManifestComponentIF instances (except IngestionManifests) will no longer be missing attributes; attributes that used to be missing will now just be None. I didn't see any cases where we wanted attributes that could be missing to be included in their class' JSON when they're None, so I changed the to_dict() methods to exclude them in this case.

Docs for dataclasses can be found here: https://docs.python.org/3.10/library/dataclasses.html

added 8 commits

• 47f690eb...47c6a12c - 7 commits from branch 2.8.2.1-DEVELOMENT
• 9af3608f - Turned ManifestComponents into dataclasses

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approved this merge request

approved this merge request

added 11 commits

• 9af3608f...1b3483a0 - 10 commits from branch 2.8.2.1-DEVELOMENT
• d1e61314 - Turned ManifestComponents into dataclasses

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merged

mentioned in commit 76281832