tree-wide: Introduce sd-forward.h and shared-forward.h headers

Let's not leak details from src/shared and src/libsystemd into
src/basic, even though you can't actually do anything useful with
just forward declarations from src/shared.

The sd-forward.h header is put in src/libsystemd/sd-common as we
don't have a directory for shared internal headers for libsystemd
yet.

Let's also rename forward.h to basic-forward.h to keep things
self-explanatory.

src/basic/capability-util.h

@@ -3,7 +3,7 @@
 
 #include <sys/capability.h>     /* IWYU pragma: export */
 
-#include "forward.h"
+#include "basic-forward.h"
 
 /* Special marker used when storing a capabilities mask as "unset". This would need to be updated as soon as
  * Linux learns more than 63 caps. */