Add ApacheDB Dialect

[napperley]

Please provide support for ApacheDB (a RDBMS written in Java under the Apache 2 license). The official JDK (versions 6-8) for instance includes a re-branded version of ApacheDB called JavaDB. OpenJDK doesn't bundle ApacheDB. Often ApacheDB is used for demonstrating new JDBC features whenever a new version of JDBC is released, and as a embedded DB (single JAR file). ApacheDB can be deployed as a DB server.

[Tapac]

@napperley , ApacheDB uses very specific ANSI SQL notation (https://wiki.apache.org/db-derby/SQLvsDerbyFeatures) and also has another limitations.
I've tried to run Exposed tests with minimal changes related to Derby and all of them failed.
I'll return to it in future, but no guaranties that we will implement it.

[AtjonTV]

How does it look with this issue?

I just stumbled across Apache Derby and wondered if Exposed supports it ..