Authentication and backend fusion update

All backend services have been merged into this one.

Also added authentication with OpenID Connect protocol.

Also added tests

__test__/models/group.test.js

-'use strict'
-
-const { Group, GroupsPolicy, GroupUser } = require('../../app/models/Group')
-
-describe("Testing 1Group entitiy", () => {
-    it('Insert new Group', async () => {
-        await Group.create({
-            name: "Test name for the Group 2.",
-            name: "Test description for the Group 2.",
-            user_id: 1
-        })
-    })
-})
-
-describe("Testing 2GroupsPolicy entity", () => {
-    it("Insert new GroupsPolicy", async () => {
-        await GroupsPolicy.create({
-            group_id: 1,
-            policy_id: 1
-        })
-    })
-})
-
-describe("Testing 3GroupUser entity", () => {
-    it("Insert new GroupUser", async () => {
-        await GroupUser.create({
-            group_id: 1,
-            user_id: 1
-        })
-    })
-})
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