Apache Superset Annotation layers are not imported/exported.

Bug description

Hi! Since version 3.1.1 import of annotation layers of all types except AnnotationType.FORMULA stopped working.

The import has a filter_chart_annotations stub which filters out all annotation types except FORMULA.

Also if charts are used as annotation layers they are not included in the export.

Screenshots/recordings

No response

Superset version

4.1.1

Python version

3.9

Node version

Browser

Chrome

Additional context

No response

Checklist

[ ] I have searched Superset docs and Slack and didn't find a solution to my problem.
[ ] I have searched the GitHub issue tracker and didn't find a similar bug report.
[ ] I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.

Comment From: dosubot[bot]

Annotation layers, except for AnnotationType.FORMULA, are not being imported or exported in Superset version 4.1.1 because the filter_chart_annotations function explicitly filters out all annotation layers that are not of type FORMULA. This behavior was introduced in version 3.1.1 as a temporary measure, as indicated by a TODO comment in the code suggesting the need to handle annotation dependencies on other charts or annotation layer objects ^[1]^[2].

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Comment From: rusackas

Honeslty, not sure if anyone's really on the case for this. PRs/investigation more than welcomed, but this is not prioritzed. Annotation Layers are one of those due-for-a-revamp backlog items.