Verify support for H2 database aliases in SQL scripts

This commit introduces a test to demonstrate how to define an alias in
an SQL script executed against an embedded H2 database.

Issue: SPR-15896

spring-jdbc/src/test/resources/org/springframework/jdbc/datasource/init/db-test-data-h2-alias.sql

@@ -0,0 +1,10 @@
+DROP ALIAS IF EXISTS REVERSE;
+
+-- REVERSE function borrowed from http://www.h2database.com/html/grammar.html#create_alias
+CREATE ALIAS REVERSE AS $$
+	String reverse(String s) {
+		return new StringBuilder(s).reverse().toString();
+	}
+$$;
+
+INSERT INTO users(first_name, last_name) values('Sam', 'Brannen');