POC to show WebSocket updates in SpringBoot using Postgres Listen/Notify

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1. Have Postgresql running.
2. Change the connection parameters in PGConn.java file. =======
3. Have Postgres running.
4. Change the Postgres connection parameters in PGConn.java file.

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3. Run the NotificationTest.java to generate some NOTIFY signals to Postgres.
4. Run the Application.java file to start SprintBoot
5. Go over to http://localhost:8080/ and press connect