build(gtest): added gtest as a subproject in case it is not already installed on the system

subprojects/googletest-1.15.2/WORKSPACE

@@ -0,0 +1,32 @@
+workspace(name = "com_google_googletest")
+
+load("//:googletest_deps.bzl", "googletest_deps")
+googletest_deps()
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+  name = "rules_python",
+  sha256 = "d71d2c67e0bce986e1c5a7731b4693226867c45bfe0b7c5e0067228a536fc580",
+  strip_prefix = "rules_python-0.29.0",
+  urls = ["https://github.com/bazelbuild/rules_python/releases/download/0.29.0/rules_python-0.29.0.tar.gz"],
+)
+
+# https://github.com/bazelbuild/rules_python/releases/tag/0.29.0
+load("@rules_python//python:repositories.bzl", "py_repositories")
+py_repositories()
+
+http_archive(
+  name = "bazel_skylib",
+  sha256 = "cd55a062e763b9349921f0f5db8c3933288dc8ba4f76dd9416aac68acee3cb94",
+  urls = ["https://github.com/bazelbuild/bazel-skylib/releases/download/1.5.0/bazel-skylib-1.5.0.tar.gz"],
+)
+
+http_archive(
+    name = "platforms",
+    urls = [
+        "https://mirror.bazel.build/github.com/bazelbuild/platforms/releases/download/0.0.10/platforms-0.0.10.tar.gz",
+        "https://github.com/bazelbuild/platforms/releases/download/0.0.10/platforms-0.0.10.tar.gz",
+    ],
+    sha256 = "218efe8ee736d26a3572663b374a253c012b716d8af0c07e842e82f238a0a7ee",
+)