feat(FastAPI): add /packages (post)

Kevin Morrisrequested to merge
kevr/aurweb:pu_packages_action_post into pu

The POST /packages route takes an action, merge_into and confirm form data arguments. It then routes over to action's callback provided by PACKAGE_ACTIONS. This commit does not implement actions, but mocks out the flow we would expect from the POST route.

Signed-off-by: Kevin Morris kevr@0cost.org

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