Database encryption callback plugin support [JDBC530]

[firebird-automations]

Submitted by: @mrotteveel

JDBC527 added support for database encryption callback support with a static reply. Introduce support for database encryption callback plugins so database encryption plugins that require a dynamic response to a challenge can be supported as well.

The initial implementation already has a starting point, but we need to refine this further and make the implementation really pluggable. This may share part of the work with authentication plugin support.

Tentatively scheduled for Jaybird 4, may be deferred to Jaybird 5.

[firebird-automations]

Modified by: @mrotteveel

Fix Version: Jaybird 5 [ 10871 ]

[mrotteveel]

Unscheduled. If there is demand, please notify me here or on https://groups.google.com/g/firebird-java

This will only be done if there is actual demand.