Convert Rule label/annotation storage to JsonField #427
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When Promgen was written, there was not a default JsonField, so labels and annotations were implemented as a class. Now that JsonField has been in Django since 3.1, it's a good time to change the implementation.
Previously, our audit log did not store change to labels/annotations (because they were separate objects), so one benefit of this migration is that those changes now show up in the edit log.
We also expect some queries to be a bit faster now that we do not need to query the other table relations for labels/annotations.
There may be some bits that could use better comments so feel free to point out the lines where the current explanation is insufficient.