Add Checkstyle and Codenarc version to Gradle version catalog

remove the unused 'gradle/checkstyle/*' and 'gradle/codenarc/codenarc.groovy'

Closes gh-131

Author: rainboyan

buildSrc/settings.gradle

@@ -77,12 +77,12 @@ configure([javadoc]) {
 }
 
 checkstyle {
-    toolVersion = "10.26.1"
+    toolVersion = libs.versions.checkstyle.get()
     configDirectory.set(rootProject.file("config/checkstyle"))
 }
 
 codenarc {
-    toolVersion = '3.6.0'
+    toolVersion = libs.versions.codenarc.get()
     config = resources.text.fromFile(rootProject.file("config/codenarc/codenarc.groovy"))
 }