Add initial JSON templates for IPoWDM orchestrator, Optical slice, TAPI...

Add initial JSON templates for IPoWDM orchestrator, Optical slice, TAPI service, and network slice service

- Created IPoWDM_orchestrator.json to define service configurations for optical and packet devices.
- Added Optical_slice.json to outline the structure for optical slice contexts and topology.
- Introduced TAPI_service.json for TAPI LSP service definitions, including service configurations and rules.
- Implemented slice1.json to specify network slice services with SLO policies and connection groups.