Analyze Data Flow: Support lambdas/anonymous functions

#KT-11994 In Progress

idea/testData/slicer/inflow/anonymousFunBodyExpression.kt

@@ -0,0 +1,9 @@
+// FLOW: IN
+
+fun foo(f: (Int) -> Int): Int {
+    return f(1)
+}
+
+fun test() {
+    val <caret>x = foo(fun(n: Int) = n)
+}