Notification system enhanced

- Base for notifcation center
- Show text in map if no data is available

backend/models/notifications/notification.interface.ts

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+import { Document } from "mongoose";
+import { IUser } from "../user/user.interface";
+
+export enum ISeverity {
+    INFO = 0,
+    SUCCESS = 1,
+    WARN = 2,
+    ERROR = 3
+}
+
+export type NotificationType = 'beat' | 'phone_alive' | 'phone_dead' | 'phone_register' | 'panic';
+
+export interface INotification extends Document {
+    type: NotificationType;
+    severity: ISeverity;
+    message: any;
+    user: IUser;
+}

backend/models/notifications/notification.model.ts

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+import { Model, model } from 'mongoose';
+import { IUser } from '../user/user.interface';
+import { INotification, ISeverity, NotificationType } from './notification.interface';
+import { schemaNotification } from './notification.schema';
+
+const modelNotification: Model<INotification> = model<INotification>('Notification', schemaNotification, 'Notification');
+export { modelNotification as Notification };
+
+export function addNotification(type: NotificationType, severity: ISeverity, message: any, user: IUser) {
+    return modelNotification.create({ type, severity, message, user });
+}

backend/models/notifications/notification.schema.ts

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+import { Schema, SchemaTypes } from 'mongoose';
+const schemaNotification = new Schema({
+    type: { type: String, required: true },
+    severity: { type: Number, required: true },
+    message: { type: Object, required: true },
+    user: { type: SchemaTypes.ObjectId }
+}, {
+    timestamps: {
+        createdAt: true,
+        updatedAt: false
+    },
+    versionKey: false
+});
+
+export { schemaNotification };