SPQR component annotation

All component classes (source, operator and emitter) must be annotated with SPQRComponent. This is required by the repository to find all component implementations during startup or deployment.

The annotation itself has four attributes to define the component:

• type: source, direct response operator, delayed response operator or emitter
• name: unique identifier used from within pipeline configuration to reference specific components
• version: version of the component implementation
• description: component description