Add retry logic

`http` has a [`retry`](https://pub.dev/packages/retry) package where we can configure our retry strategy.

Many Apps, like mine, need to have a contiguous and reliable websocket connection. We can achieve something like this now on this library listening for the Stream `done`, but that's not simple. It would be a lot nicer if the library could provide a mechanism for auto retries.

Review the existing handling of the Stream `done` event and the proposed pub.dev `retry` package. Clarify how configurable retries should apply to websocket connections and what failure or reconnection behavior is expected; the work is done when the library provides that agreed retry mechanism.

Written by the indexing model from the issue text.