Revise prepared statement creation [JDBC539]

[firebird-automations]

Submitted by: @mrotteveel

The creation of prepared statement relies on too much being done in the constructor. This should be reviewed and revised, maybe with statement preparation being moved to a separate method. See also JDBC538.

When doing this, it might be good to review current statement registration and notification, because it seems rather convoluted.

[firebird-automations]

Modified by: @mrotteveel

Fix Version: Jaybird 5 [ 10871 ]