Closes#1029
This PR introduces support for the newly introduced evaluation and sync
schemas.
Supporting both the old and new schemas involves some duplication, but I
tried to keep it as minimal as possible. I'm of course open for
suggestions for any ideas on how to make this simpler :)
See reasoning for new naming
[here](https://github.com/open-feature/flagd/issues/948).
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Signed-off-by: Florian Bacher <florian.bacher@dynatrace.com>
Co-authored-by: Todd Baert <todd.baert@dynatrace.com>