readline: add history event and option to set initial history
Add a history event which is emitted when the history has been changed. This enables persisting of the history in some way but also to allows a listener to alter the history. One use-case could be to prevent passwords from ending up in the history.
A constructor option is also added to allow for setting an initial history list when creating a Readline interface.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines