price-reporter: ws-server: Retry connection on send failure

[joeykraut]

Purpose

This PR makes two changes:

1. We refactor the price_stream_task into a retry wrapper that calls manage_connection. This captures a broader set of errors that may be retried, including error sending a keepalive on a closed connection. Looking at our logs, this makes up the majority of server failures
2. Adds logging for the case in which re-establishing a connection fails

Testing

• Ran the price reporter locally and simulated a failure, verified that the recovery logic worked as expected

[akirillo]

clean