[moetemp]

What changed?

This PR adds RedisStreams and MemoryStreams, the client plugins that name the store Core runs.

• StreamStorePlugin is a SimplePlugin that connects the store in connect_service_client. The client's handles and the Activities of every Worker built from it use that store.
• RedisStreams takes URLs and Core's settings. TLS comes from a rediss:// URL and checks the server against the system roots only. MemoryStreams() is for tests.
• A store on a Worker alone raises ValueError, and so does a second store on one client or a second connection on one store.
• delete_workflow_streams(namespace, workflow_id) goes through Core's DeleteOwner.

Why?

Core runs the store, so the provider classes become configuration (DD-6, DD-90). Core checks a stream's owner over the connection that connected the store, so the store comes from the client.

How did you test it?

Link to a test plan if any -

• Unit Tests
• Staging
• End to End Tests

tests/contrib/streams/test_store_plugin.py runs on the dev server.

[moetemp]

Combined into #240.