feat: Enhance RemoteServer and Console create-user to assign group

[gramian]

What does this PR do?

1. The RemoteServe class method createUser is overloaded with a variant with the signature

public void createUser(final String userName, final String password, final HashMap<String,String> databases)

As for the HTTP API server command the databases HashMap should have keys being database names and values being a group name.
The former function with a List<String> databases argument is still available, but its body changed so that the new method is called by it.

2. The Console class method executeCreateUser is updated so the new RemoteServer createUser method is used. However not too robustly, and error handling is defered to the RemoteServer or eventually to the ServerSecurityUser class.

So now in console the following can be done:

CREATE USER user IDENTIFIED BY password GRANT CONNECT TO db:group

Motivation

Missing capability to assign group during user creation in console, even though possibl via HTTP API.

Additional Notes

It is possible to pass an empty group, but AFAIK this is also allowed in the HTTP server command.

Checklist

• I have run the build using mvn clean package command
• My unit tests cover both failure and success scenarios

[robfrank]

my suggestion:
final Map<String,String>...

[robfrank]

again, prefer interface:
final Map<String,String

[robfrank]

again:
Map<String,String> databasesWithGroups = new HashMap<String, String>();

[lvca]

Good for me ;-)

[robfrank]

LGTM