Split ReplaceSingleLineLetInspection to SimpleRedundantLet & ComplexRedundantLet

Relates to #KT-32010

idea/testData/inspectionsLocal/simpleRedundantLet/invokeCall4.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+// WITH_RUNTIME
+class A {
+    operator fun invoke(a: A, i: Int) {}
+}
+
+fun foo(a: A) {
+    a.<caret>let { it(it, 1) }
+}