Implement a Useful main Method

[Michael-A-McMahon]

Provider jars should have a main method which does something useful.

Right now, the jars just do this:

java -jar ojdbc-provider-azure-0.1.0-SNAPSHOT.jar
no main manifest attribute, in ojdbc-provider-azure-0.1.0-SNAPSHOT.jar

That's not very useful.

A main method that prints the names of providers would be useful, as the Oracle JDBC Driver must be configured with these names. We might think of other useful things to print, and include those as well.