Copy sharing/internal, sharing/common and sharing/scheduling to github.

- Move Abseil pin to same as that used in Chromium.
- Disabled layering_check due to build failure in absl.

PiperOrigin-RevId: 596631921

internal/platform/implementation/windows/BUILD

@@ -47,7 +47,7 @@ cc_library(
         "-Wno-vla-extension",
     ],
     defines = ["_SILENCE_CLANG_COROUTINE_MESSAGE"],
-    visibility = ["//third_party/nearby/sharing/internal/impl/windows:__pkg__"],
+    visibility = ["//sharing/internal/impl/windows:__pkg__"],
     deps = [
         ":comm",
         "//base",
@@ -207,7 +207,7 @@ cc_library(
         "//fastpair:__subpackages__",
         "//location/nearby:__subpackages__",
         "//presence:__subpackages__",
-        "//third_party/nearby/sharing:__subpackages__",
+        "//sharing:__subpackages__",
     ],
     deps = [
         ":comm",

internal/platform/implementation/windows/generated/BUILD

@@ -46,6 +46,6 @@ cc_library(
         "//internal:__subpackages__",
         "//internal/platform/implementation/windows:__subpackages__",
         "//location/nearby/cpp/sharing/implementation/internal:__subpackages__",
-        "//third_party/nearby/sharing:__subpackages__",
+        "//sharing:__subpackages__",
     ],
 )