Approvals

[matmair]

Simplified implementation of approvals for orders. Includes building blocks for a more generalized rules and templates driven approach.

Function

This PR adds approvals (optionally) for POs. You can enable them in settings (including minimum approvers and maximum rejections). After that POs can only be placed once they are approved.

Notifications

Notifications will be sent out to the responsible user/group:

• when approval starts
• on each approval decision
• after being rejected (PO will be cancelled)
• after being approved (PO will be moved to placed)

UI

As an experiment, I just implemented this in P UI. While the order views are not ready in P UI, approvals are.

Next steps

This is an MVP, I opened an epic for further improvements #5097.
While this PR adds a business logic and UI for PO approvals, approvals are a first-class citizen implementation-wise. They can be used as-is for any model and adding UI elements for that should be simple. The default rules engine is also simple right now but designed for complex requirements. If there is interest this can be extended.

Still to address

Preview Give feedback

1. Add a general approval flow (creation/viewing/approval/declining)
2. Make orders a bit more helpful
3. Jump-of-point to the general approval thing in C UI
4. Migrate PO stuff into its own PR
5. Add auto-generation of approval names
6. Add UI for choosing name for approval
7. Add docs
8. Add info-bubble with link to epic for feedback

Closes #3501

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[matmair]

@inventree/triage this would be ready for a review round.
The order view in P UI is not done by any means, I just added the skeleton needed to show how that could be integrated pending on finalisation of the design.

[matmair]

I updated the description with the things I found to be still missing after a few hours away from this.