Implement Product Specification Characteristics' listing

Create a new tab in the Produce Specification create/update view:

• Product Specification Characteristics (following the same concept of Service Specification Characteristics listing)

The view needs to:

• list
• filter
• create/update characteristics
• check if new properties (different in Product Specification Characteristics) need to appear

Acknowledgements

This work is supported by the EU-funded HORIZON-JU-SNS-2022 FIDAL project with Grant Agreement number 101096146 and the EU-funded HORIZON-CL4-2024-DATA COP-PILOT project with Grant Agreement number 101189819.