Split ReplaceSingleLineLetInspection to SimpleRedundantLet & ComplexRedundantLet

Relates to #KT-32010

idea/testData/inspectionsLocal/complexRedundantLet/invokeCall.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+class A {
+    operator fun invoke() {}
+}
+
+fun foo(a: A) {
+    a.<caret>let { it() }
+}