[SPARK-18182] Expose ReplayListenerBus.read() overload which takes string iterator

The `ReplayListenerBus.read()` method is used when implementing a custom `ApplicationHistoryProvider`. The current interface only exposes a `read()` method which takes an `InputStream` and performs stream-to-lines conversion itself, but it would also be useful to expose an overloaded method which accepts an iterator of strings, thereby enabling events to be provided from non-`InputStream` sources.

Author: Josh Rosen <joshrosen@databricks.com>

Closes #15698 from JoshRosen/replay-listener-bus-interface.