[Experience Index] Soft delete experiences and relations

[lebaudantoine]

Feature Request

Is your feature request related to a problem or unsupported use case? Please describe.
Have a way to softly delete LOM and their relations.

Describe the solution you'd like
Add an endpoint in the experience index API, that archive experiences.
Implement missing feature in the Experience and Relation clients.

Might be necessary to implement the meta-data and lifecycle parts of LOM data modeling to track the life of a LOM object.