refactor: migrate BUILD files to explicit rules_cc imports

Add explicit load statements for cc_binary, cc_library, and cc_test
from @rules_cc//cc:defs.bzl in:
- shared/cpp/BUILD.bazel
- swift/logging/BUILD.bazel
- misc/bazel/internal/zipmerge/BUILD.bazel

misc/bazel/internal/zipmerge/BUILD.bazel

@@ -1,3 +1,5 @@
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library", "cc_test")
+
 cc_library(
     name = "lib",
     srcs = [
@@ -28,7 +30,7 @@ cc_test(
     linkstatic = True,  # required to build the test in the internal repo
     deps = [
         ":lib",
-        "@bazel_tools//tools/cpp/runfiles",
         "@googletest//:gtest_main",
+        "@rules_cc//cc/runfiles",
     ],
 )

shared/cpp/BUILD.bazel

@@ -1,3 +1,5 @@
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
 cc_library(
     name = "extractor_shared",
     srcs = glob(["*.cpp"]),

swift/logging/BUILD.bazel

@@ -1,3 +1,5 @@
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
 cc_library(
     name = "logging",
     srcs = glob(["*.cpp"]),