Introduce warning for private inline functions which return anonymous objects without specified supertypes (KT-33917)

compiler/testData/diagnostics/tests/inline/returnedAnonymousObjects.fir.kt

@@ -0,0 +1,11 @@
+private inline fun foo(crossinline f: () -> Int) = object {
+    fun bar(): Int = f()
+}
+
+fun test(b: Boolean) {
+    var x = foo { 1 }
+    if (b) {
+        x = foo { 2 }
+    }
+    x.bar()
+}

compiler/testData/diagnostics/tests/inline/returnedAnonymousObjects.kt

@@ -0,0 +1,11 @@
+private inline fun <!PRIVATE_INLINE_FUNCTIONS_RETURNING_ANONYMOUS_OBJECTS!>foo<!>(crossinline f: () -> Int) = object {
+    fun bar(): Int = f()
+}
+
+fun test(b: Boolean) {
+    var x = foo { 1 }
+    if (b) {
+        x = foo { 2 }
+    }
+    x.bar()
+}

compiler/testData/diagnostics/tests/inline/returnedAnonymousObjects.txt

@@ -0,0 +1,4 @@
+package
+
+private inline fun foo(/*0*/ crossinline f: () -> kotlin.Int): foo.<no name provided>
+public fun test(/*0*/ b: kotlin.Boolean): kotlin.Unit