Incorporate Camunda Engine specific modules:

• feel-engine-factory
• feel-camunda-spin

AT:

• Drop the feel-engine-plugin since we can use the factory directly in the DMN Engine
• The factory and the spin artifact can go into our code base (platform)
• The factory should be a dependency of scope compile in DMN Engine
• Remove the DmnTypeTransformers from the feel-engine-factory to avoid a circular dependency with the DMN Engine (see CAM-11286 for porting them)
• Exclude the slf4j-api dependency from the scala feel-engine dependency in the feel factory. The slf4j-api dependency is obtained transitively through camunda-commons-logging