openSUSE / agama / 8268840686

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Expose the manager service through the HTTP/JSON API (#1089)

Trello:
https://trello.com/c/Ff8n3NVZ/3563-5-expose-the-manager-api-over-http

This PR exposes most of the Manager API[^1] through the interface. It
includes:

* `api/manager/probe`: starts the probing.
* `api/manager/install`: starts the installation.
* `api/manager/finish`: executes the post-install tasks.
* `api/manager/status`: expose the manager status`

```rust
{
  "phase": "Config",
  "busy": [
    "org.opensuse.Agama.Storage1"
  ]
}
```

Additionally, it emits two events: `BusyServicesChanged` and
`InstallationPhaseChanged`.

[^1]: The part of the D-Bus API used by the web UI.

## To do

- [x] Before proceeding, we need to merge #1080.
- [ ] ~~Add a mechanism to get the logs~~ (postponed).
- [x] Add a `CanInstall` boolean to the manager status.

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