New Feature: Global Notification Service

[natanbr]

In this feature you are asked to implement a global notification service.
The goal of this feature is to help us better evaluate your Angular skills,
Please avoid using any external libraries❕

There are 2 places this service is used:

1. Clicking on any of the "Info", "Success" or "Failure" buttons on the top will trigger an event that will display a notification.
2. In "comments.service.ts" you will find a TODO to call that global notification
   

Requirements:

• The global notification message should support 3 types of messages: "Info", "Success" and "Error"
• Each notification can have a title (one line) and a message (up to 3 lines)
• User should be able to dismiss the notification by clicking on X button
• The notification should have nice animation on "enter" and another animation on "leave"

Nice to have:

• auto dismiss the notification after x seconds (use 3 seconds by default)

Example:

Here is an example of this feature the way I decided to implement it.
You DON'T need to do it one to one. On the contrary, creating will be reworded

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