Restructure the project

[richardnfag]

For the advancement of the project, it will be necessary to restructure it.

This project will be divided into the following structure:

├── service
│ ├── core (performs direct communication with the functions)
│ ├── server (provides the manipulation of functions through a REST API or GraphQL API)
├── ui (provides a WEB interface to the service layer)
├── cli (provides a command-line interface to the service layer)