Support equals/hashCode for fun interfaces in JVM and JVM_IR

#KT-33455 Fixed

compiler/testData/codegen/box/funInterface/equality/simpleLambdas.kt

@@ -0,0 +1,14 @@
+// IGNORE_BACKEND: JS_IR
+// IGNORE_BACKEND_FIR: JVM_IR
+
+fun interface FunInterface {
+    fun invoke()
+}
+
+private fun id(f: FunInterface): Any = f
+
+fun box(): String {
+    if (id { "lambda" } == id { "lambda" }) return "Fail: SAMs over lambdas are never equal"
+
+    return "OK"
+}