DB drivers declarations refactoring

[iliyan-velichkov]

Drivers cleanup.

• include each driver in corresponding database-sql-* project
• add databases support by adding only the following

<dependency>
	<groupId>org.eclipse.dirigible</groupId>
	<artifactId>dirigible-components-group-database</artifactId>
	<type>pom</type>
</dependency>

• remove unnecessary declarations