(CTTC) Implement NBI connector IETF L3-VPN Service Delivery
# Proposers
- Lluis Gifre (CTTC)
- Ricard Vilalta (CTTC)
- Raul Muñoz (CTTC)
# Description
Implement basic connector for the YANG Data Model for L3VPN Service Delivery (IETF RFC8299 [1]) in NBI component to offer L3-VPN services.
# Demo or definition of done
An RFC8299-compliant endpoint should be exposed in the NBI component.
# Acknowledgements
This work is funded by the European Commission through the HORIZON-JU-SNS-2022 ACROSS project with Grant Agreement number 101097122.
# References
1. [Q. Wu, S. Litkowski, L. Tomotaki, K. Ogaki, "YANG Data Model for L3VPN Service Delivery," IETF RFC8299, January 2018](https://datatracker.ietf.org/doc/html/rfc8299)
# Feature Design (for New-Features)
## Clarifications to Expected Behavior Changes
None
## Assumptions
None
## Impacted Components
NBI
## Compute Impact
Implement connector according to RFC8299.
## Testing
- Upload topology
- Test creation, retrieval, update, and removal of L3VPNs via `curl`.
- Review format is compliant.
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