chore: Update H2 database dependency and configuration

src/main/resources/application.properties

@@ -1 +1,14 @@
 spring.application.name=DataDash
+
+# Datasource configuration
+spring.datasource.url=jdbc:h2:mem:studentcoursedb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE
+spring.datasource.driverClassName=org.h2.Driver
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.sql.init.mode=always
+spring.jpa.hibernate.ddl-auto=none
+
+# Uncomment for web console
+#spring.h2.console.enabled=true
+#spring.h2.console.path=/h2-console
+#spring.datasource.username=sa
+#spring.datasource.password=pwd