[FIR] Add ExtensionFunctionType attribute

#KT-39034 Fixed

compiler/fir/analysis-tests/testData/resolve/inference/nestedExtensionFunctionType.kt

@@ -0,0 +1,19 @@
+// ISSUE: KT-39034
+
+interface A
+
+fun test_0(a: A, f: A.() -> Unit) {
+    a.f()
+}
+
+fun test_1(a: A, ys: List<A.() -> Unit>) {
+    for (y in ys) {
+        a.y()
+    }
+}
+
+fun test_2(a: A, vararg zs: A.() -> Unit) {
+    for (z in zs) {
+        a.z()
+    }
+}

compiler/fir/analysis-tests/testData/resolve/inference/nestedExtensionFunctionType.txt

@@ -0,0 +1,22 @@
+FILE: nestedExtensionFunctionType.kt
+    public abstract interface A : R|kotlin/Any| {
+    }
+    public final fun test_0(a: R|A|, f: R|A.() -> kotlin/Unit|): R|kotlin/Unit| {
+        R|<local>/f|.R|FakeOverride<kotlin/Function1.invoke: R|kotlin/Unit|>|(R|<local>/a|)
+    }
+    public final fun test_1(a: R|A|, ys: R|kotlin/collections/List<kotlin/Function1<A, kotlin/Unit>>|): R|kotlin/Unit| {
+        lval <iterator>: R|kotlin/collections/Iterator<kotlin/Function1<A, kotlin/Unit>>| = R|<local>/ys|.R|FakeOverride<kotlin/collections/List.iterator: R|kotlin/collections/Iterator<kotlin/Function1<A, kotlin/Unit>>|>|()
+        while(R|<local>/<iterator>|.R|kotlin/collections/Iterator.hasNext|()) {
+            lval y: R|(A) -> kotlin/Unit| = R|<local>/<iterator>|.R|FakeOverride<kotlin/collections/Iterator.next: R|(A) -> kotlin/Unit|>|()
+            R|<local>/y|.R|FakeOverride<kotlin/Function1.invoke: R|kotlin/Unit|>|(R|<local>/a|)
+        }
+
+    }
+    public final fun test_2(a: R|A|, vararg zs: @R|kotlin/ExtensionFunctionType|() R|kotlin/Array<out kotlin/Function1<A, kotlin/Unit>>|): R|kotlin/Unit| {
+        lval <iterator>: R|kotlin/collections/Iterator<kotlin/Function1<A, kotlin/Unit>>| = R|<local>/zs|.R|FakeOverride<kotlin/Array.iterator: R|kotlin/collections/Iterator<kotlin/Function1<A, kotlin/Unit>>|>|()
+        while(R|<local>/<iterator>|.R|kotlin/collections/Iterator.hasNext|()) {
+            lval z: R|(A) -> kotlin/Unit| = R|<local>/<iterator>|.R|FakeOverride<kotlin/collections/Iterator.next: R|(A) -> kotlin/Unit|>|()
+            R|<local>/z|.R|FakeOverride<kotlin/Function1.invoke: R|kotlin/Unit|>|(R|<local>/a|)
+        }
+
+    }