add interceptors
merge  interceptors
refractor interceptors
merge interceptors to 3.0
Merge and refactor Salaheddine pull request for interceptors
Merge branch '3.0' into WIP_3.0
IT almost OK, UT KO. Rename merge to update and change signature. Rename getReference to getProxy. Rename unwrap to removeProxy
Add interceptor triggers to slice query, typed query & raw typed query. Add ITs to cover those cases
Create triggers folder for embedded Cassandra. Fix bug when preparing twice ps for clustered countered entities
Refactor persist() and update() API