FIC: Add synthetic constructors for fun interfaces aka explicit FIC

compiler/testData/diagnostics/tests/funInterface/funInterfaceSyntheticConstructors.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: +NewInference +SamConversionForKotlinFunctions +SamConversionPerArgument +FunctionInterfaceConversion
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun interface KRunnable {
+    fun invoke()
+}
+
+typealias KRunnableAlias = KRunnable
+
+fun foo(f: KRunnable) {}
+
+fun test() {
+    foo(KRunnable {})
+    foo(KRunnableAlias {})
+}

compiler/testData/diagnostics/tests/funInterface/funInterfaceSyntheticConstructors.txt

@@ -0,0 +1,12 @@
+package
+
+public fun foo(/*0*/ f: KRunnable): kotlin.Unit
+public fun test(): kotlin.Unit
+
+public interface KRunnable {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public abstract fun invoke(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+public typealias KRunnableAlias = KRunnable