[FIR] Add diagnostics for object related problems

compiler/testData/diagnostics/tests/objects/ObjectsLocal.fir.kt

@@ -16,7 +16,7 @@ fun test() {
     }
     b.foo()
 
-    object B {
+    <!LOCAL_OBJECT_NOT_ALLOWED!>object B<!> {
         fun foo() {}
     }
     B.foo()

compiler/testData/diagnostics/tests/objects/localObjects.fir.kt

@@ -1,15 +1,15 @@
 // !DIAGNOSTICS: -UNUSED_VARIABLE
 
 fun foo() {
-    object a {}
+    <!LOCAL_OBJECT_NOT_ALLOWED!>object a<!> {}
     val b = object {
-        object c {}
+        <!LOCAL_OBJECT_NOT_ALLOWED!>object c<!> {}
     }
     b.c
     class A {
-        object d {}
+        <!LOCAL_OBJECT_NOT_ALLOWED!>object d<!> {}
     }
     val f = {
-        object e {}
+        <!LOCAL_OBJECT_NOT_ALLOWED!>object e<!> {}
     }
 }