macOS Metal + AppKit app (#2205)

Co-authored-by: mwilsnd <mwilsnd@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

BUILD.bazel

@@ -139,6 +139,9 @@ cc_library(
         "@platforms//os:ios": [
             "//vendor:icu",
         ],
+        "@platforms//os:osx": [
+            "//vendor:icu",
+        ],
         "//conditions:default": [],
     }) + select({
         ":metal_renderer": [
@@ -240,3 +243,13 @@ js_library(
         ":node_modules/ejs",
     ],
 )
+
+cc_library(
+    name = "maplibre_lib",
+    srcs = [],
+    visibility = ["//visibility:public"],
+    deps = select({
+        "@platforms//os:macos": ["//platform:macos-objcpp"],
+        "//conditions:default": [],
+    }),
+)