[Improvement][spi-alert]script plugin should contain alert content

fix alert params contain space not parse

fix  stream not close

dolphinscheduler-alert-plugin/dolphinscheduler-alert-script/src/test/java/org/apache/dolphinscheduler/plugin/alert/script/ScriptSenderTest.java

@@ -47,7 +47,6 @@ public class ScriptSenderTest {
 
     @Test
     public void testScriptSenderTest() {
-
         ScriptSender scriptSender = new ScriptSender(scriptConfig);
         AlertResult alertResult;
         alertResult = scriptSender.sendScriptAlert("test title Kris", "test content");