create base/ subdir and expand :status build target to :base

upb.h is now just a temporary stub

PiperOrigin-RevId: 488255988

upb/string_view.h

diff --git a/upb/string_view.h b/upb/string_view.h
index bc735d9..0e0fadd 100644
--- a/upb/string_view.h
+++ b/upb/string_view.h
@@ -25,51 +25,11 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// This header is deprecated, use upb/base/string_view.h instead
+
 #ifndef UPB_STRING_VIEW_H_
 #define UPB_STRING_VIEW_H_
 
-#include <string.h>
-
-// Must be last.
-#include "upb/port/def.inc"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// LINT.IfChange(struct_definition)
-typedef struct {
-  const char* data;
-  size_t size;
-} upb_StringView;
-// LINT.ThenChange(GoogleInternalName0)
-
-UPB_INLINE upb_StringView upb_StringView_FromDataAndSize(const char* data,
-                                                         size_t size) {
-  upb_StringView ret;
-  ret.data = data;
-  ret.size = size;
-  return ret;
-}
-
-UPB_INLINE upb_StringView upb_StringView_FromString(const char* data) {
-  return upb_StringView_FromDataAndSize(data, strlen(data));
-}
-
-UPB_INLINE bool upb_StringView_IsEqual(upb_StringView a, upb_StringView b) {
-  return a.size == b.size && memcmp(a.data, b.data, a.size) == 0;
-}
-
-#define UPB_STRINGVIEW_INIT(ptr, len) \
-  { ptr, len }
-
-#define UPB_STRINGVIEW_FORMAT "%.*s"
-#define UPB_STRINGVIEW_ARGS(view) (int)(view).size, (view).data
-
-#ifdef __cplusplus
-} /* extern "C" */
-#endif
-
-#include "upb/port/undef.inc"
+#include "upb/base/string_view.h"
 
 #endif /* UPB_STRING_VIEW_H_ */