Suggest to replace 'substring' calls by take/drop/dropLast calls when possible

#KT-10196 Fixed

idea/testData/intentions/replaceSubstringWithSubstringBefore/immutableProperty.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+
+class A(val x: String)
+
+fun foo(a: A) {
+    a.x.substring<caret>(0, a.x.indexOf('x'))
+}