Merge pull request #42383 from Thevakumar-Luheerathan/fix-ballerina-l…

…ang-pr-42291

Set compiler plugin cache `getData` api to package private

compiler/ballerina-lang/src/main/java/io/ballerina/projects/CompilerPluginCache.java

@@ -43,7 +43,7 @@ public CompilerPluginCache() {
      * @param key compiler plugin id
      * @return data holder map for the plugin
      */
-    public Map<String, Object> getData(String key) {
+    Map<String, Object> getData(String key) {
         if (!pluginMap.containsKey(key)) {
             pluginMap.put(key, new HashMap<>());
         }