As stream writer workers are also powered by the `generic_worker`
Synapse app, this necessitated that we provide means for distinguishing
between them and regular `generic_workers`.
I've also taken the time to optimize nginx configuration generation
(more Jinja2 macro usage, less duplication).
Worker names have also changed.
Workers are now named sequentially like this:
- `matrix-synapse-worker-0-generic`
- `matrix-synapse-worker-1-stream-writer-typing`
- `matrix-synapse-worker-2-pusher`
instead of `matrix-synapse-worker_generic_worker-18111` (indexed with a
port number).
People who modify `matrix_synapse_workers_enabled_list` directly will
need to adjust their configuration.
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