Centralize more endpoints in a blueprint

[might move to flask-resources]

When an application becomes complex, with several endpoints, many times we have to create a resource for just one route. e.g. `invenio-draft-resources`:

```python
app.register_blueprint(record_bp)
app.register_blueprint(draft_bp)
app.register_blueprint(draft_action_bp)
app.register_blueprint(draft_version_bp)
```

We might want to provide yes-another-level of abstraction. Sort of `as_blueprint(actions=True, version=True)` or something like that.