Added support for C codegen

.github/workflows/build.yaml

@@ -31,7 +31,7 @@ jobs:
         run: ./ci/generate.sh
 
       - name: Test
-        run: bazel test --test_output=all //test-suite:djinni-java-tests  //test-suite:djinni-objc-tests
+        run: bazel test --test_output=all //test-suite:djinni-java-tests  //test-suite:djinni-objc-tests //test-suite:djinni-tests-c
 
       - name: External Test
         working-directory: external-test

WORKSPACE

@@ -75,3 +75,10 @@ emsdk_deps()
 
 load("@emsdk//:emscripten_deps.bzl", emsdk_emscripten_deps = "emscripten_deps")
 emsdk_emscripten_deps()
+
+http_archive(
+    name = "gtest",
+    strip_prefix = "googletest-1.13.0",
+    url = "https://github.com/google/googletest/archive/refs/tags/v1.13.0.tar.gz",
+    integrity = "sha256-rX/boR6gEcHZJbMonPSvLGajUuGNTHJkOS/q116Rk2M=",
+)