Make the 'verifier' target public.

That target exposes core/api/verifier.h, which was previously part of
the public model_builder.h file (and which is still #included by that
file). model_builder.h is already exposed as part of the public
'//third_party/tensorflow/lite:framework' target.
This change allows code that uses tflite::TfLiteVerifier
to follow include-what-you-use and #include core/api/verifier.h
rather than #including model_builder.h and depending on the
public framework target.

PiperOrigin-RevId: 336713520
Change-Id: I300df719372bcef3b0d4993a641c2a7f76b3cfa9

tensorflow/lite/core/api/BUILD

@@ -79,10 +79,7 @@ cc_library(
     hdrs = ["verifier.h"],
     compatible_with = get_compatible_with_portable(),
     copts = tflite_copts() + micro_copts(),
-    visibility = [
-        "//tensorflow/lite:__subpackages__",
-        "//tensorflow_lite_support:__subpackages__",
-    ],
+    visibility = ["//visibility:public"],
     deps = [":error_reporter"],
 )