Add event source source operator #106
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This PR adds a source for the EventSource protocol (also called server-sent events).
This is a lightweight, HTTP streaming protocol. Supporting it allows Arroyo to read from a variety of open streaming sources, like the mastodon firehose (https://docs.joinmastodon.org/methods/streaming/#public), for example the one available at https://mstdn.social/api/v1/streaming/public.
This PR also refactors the serialization code used by the kafka source, to make it usable from other sources without code duplication.