Adds Kiro and Visual Studio Code directories to the .gitignore file. Some reorganization of this file. (#6353)

Signed-off-by: David Venable <dlv@amazon.com>

Author: dlvenable

.gitignore

@@ -1,13 +1,6 @@
-# Ignore Gradle project-specific cache directory
-.DS_Store
-.idea
-*.iml
-.gradle
-
-# Ignore Gradle build output directory
+# Gradle directories
 build
-
-# Ignore things downloaded for gradle es plugin
+.gradle
 gradle/tools
 
 # Ignore config file generated by test
@@ -19,3 +12,10 @@ data-prepper-main/src/test/resources/logstash-conf/logstash-filter.yaml
 
 # output folder created when we run test cases
 **/out/
+
+# Development tools
+.DS_Store
+.idea
+*.iml
+.kiro
+.vscode