make move use =wasMoved internally (#22032)

* make `move` use `=wasMoved` internally

* fixes tests

* fixes spawn finally

* fixes views

* rename to internalMove

* add a test case

tests/destructor/twasmoved.nim

@@ -0,0 +1,14 @@
+type
+  Foo = object
+    id: int
+
+proc `=wasMoved`(x: var Foo) =
+  x.id = -1
+
+proc foo =
+  var s = Foo(id: 999)
+  var m = move s
+  doAssert s.id == -1
+  doAssert m.id == 999
+
+foo()