Added JDBC and @Transactional support to Groovy CLI

* @EnableTransactionManagement triggers spring-tx imports
* Field or method of type JdbcTemplate or NamedParameterJdbcTemplate
  of DataSource triggers spring-jdbc imports

spring-boot-cli/samples/tx.groovy

@@ -0,0 +1,18 @@
+package org.test
+
+@Grab("org.hsqldb:hsqldb:2.2.9")
+
+@Configuration
+@EnableTransactionManagement
+class Example implements CommandLineRunner {
+
+  @Autowired
+  JdbcTemplate jdbcTemplate
+
+  @Transactional
+  void run(String... args) {
+    println "Foo count=" + jdbcTemplate.queryForObject("SELECT COUNT(*) from FOO", Integer)
+  }
+
+}
+