Fixing an issue that causes a race condition when multiple functions
are present in a Kafka Streams application by isolating the responsible
proxy factory per function and not shared.
When multiple Kafka Streams functions are present in an application,
it should be possible to set the application id per function.
When an application provides a bean of type Serde, then the binder
should try to introspect that bean to see if it can be matched for
any inbound or outbound serialization.
Adding tests to verify the changes.
Adding docs.
Resolves#734, #735, #736
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