cvd: Apply include-cleaner to key_equals_value

Apply the `with_include_cleaner` clang-tidy configuration to the
`key_equals_value` directory. Fix the resulting missing include
errors in `key_equals_value_test.cc`.

Assisted-by: Gemini:Flash-Preview

Author: Databean

base/cvd/BUILD.bazel

@@ -27,6 +27,7 @@ filegroup(
     name = "clang_tidy_config",
     srcs = [
         ".clang-tidy",
+        "//cuttlefish/common/libs/key_equals_value:.clang-tidy",
         "//cuttlefish/host/commands/assemble_cvd/android_build:.clang-tidy",
         "//cuttlefish/host/commands/cvd/cli/commands:.clang-tidy",
         "//cuttlefish/host/commands/kernel_log_monitor:.clang-tidy",

base/cvd/cuttlefish/common/libs/key_equals_value/.clang-tidy

@@ -0,0 +1 @@
+../../../../clang_tidy_configs/with_include_cleaner

base/cvd/cuttlefish/common/libs/key_equals_value/BUILD.bazel

@@ -4,6 +4,8 @@ package(
     default_visibility = ["//:android_cuttlefish"],
 )
 
+exports_files([".clang-tidy"])
+
 cf_cc_library(
     name = "key_equals_value",
     srcs = ["key_equals_value.cc"],

base/cvd/cuttlefish/common/libs/key_equals_value/key_equals_value_test.cc

@@ -15,6 +15,8 @@
 
 #include "cuttlefish/common/libs/key_equals_value/key_equals_value.h"
 
+#include <functional>
+#include <map>
 #include <string>
 
 #include "gmock/gmock-matchers.h"