Caila client entities

[Denire]

Caila NLU Provider (not sure about other nlu providers) support client entities. This issue suggests creating proper generic API for framework users to use client entities, allowing basic CRUD operations to manipulate entities and entity records.

What is client entity?
Client entity is some entity which synonyms and values are stored in NLU provider by clientId.

This issue suggest adding CAILA client entities support (http client + model + dsl methods).