FIR IDE: add APIs about FunctionClassKind

analysis/analysis-api/testData/components/functionClassKind/kFunction.kt

@@ -0,0 +1,11 @@
+// WITH_REFLECT
+
+import kotlin.reflect.KFunction1
+
+fun <T, R> foo(p: T, mapper : (T) -> R): R {
+    mapper(p)
+}
+
+fun bar() {
+    foo(1, x<caret>y as KFunction1<Int, String>)
+}