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Expose the Progress interface through the HTTP/JSON API (#1092)

Trello:
https://trello.com/c/2RvcZBFR/3564-5-expose-the-progress-api-over-http

This PR exposes the `Progress` API for the Manager and Software services
through the HTTP/JSON interface. It is implemented as a pair of
functions that can be reused in all services that want to implement such
an interface.

## A `/SERVICE/progress` endpoint

The `progress_router` function allows to add a `/SERVICE/progress` route
that exposes the current progress:

```json
{
  "current_step": 4,
  "max_steps": 4,
  "current_title": "Calculating the software proposal",
  "finished": false
}
```

## The events stream

The `progress_stream` builds an events stream that emits a new event
when the `current_step` changes:

```json
{
  "type": "Progress",
  "service": "org.opensuse.Agama.Software1",
  "current_step": 4,
  "max_steps": 4,
  "current_title": "Calculating the software proposal",
  "finished": false
}
```

## Enabling `ServiceStatus` and `Progress` for the Software service

Additionally, the PR enables the `ServiceStatus` (implemented
https://github.com/openSUSE/agama/pull/1089) and the `Progress` for the
Software service too.

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