extract parameter object: set getter name by field if present (IDEA-152098)

java/java-tests/testData/refactoring/introduceParameterObject/existingWithAnotherFieldNames/after/Param.java

@@ -0,0 +1,15 @@
+class Param {
+    private String myClass;
+
+    public P(String myClass) {
+        this.myClass = myClass;
+    }
+
+    public String getSourceClass() {
+        return myClass;
+    }
+
+    public String getMyClass() {
+        return myClass;
+    }
+}

java/java-tests/testData/refactoring/introduceParameterObject/existingWithAnotherFieldNames/after/Test.java

@@ -0,0 +1,5 @@
+public class Test {
+  void foo(Param param) {
+    System.out.println(param.getMyClass());
+  }
+}