feat: add C & Zig bindings for unix acceptor and connector

test/unx_c_api.cpp

@@ -0,0 +1,25 @@
+#include "tests.hpp"
+#include <thespian/c/unx.h>
+
+using namespace thespian;
+
+// Very small smoke test for the new C API.  We don't actually open sockets,
+// just verify that the create/destroy functions work and return non-null.
+
+auto unx_c_api(thespian::context &ctx, bool &result, thespian::env_t env)
+    -> thespian::result {
+  (void)ctx;
+  (void)env;
+
+  struct thespian_unx_acceptor_handle *a = thespian_unx_acceptor_create("tag");
+  check(a != nullptr);
+  thespian_unx_acceptor_destroy(a);
+
+  struct thespian_unx_connector_handle *c =
+      thespian_unx_connector_create("tag");
+  check(c != nullptr);
+  thespian_unx_connector_destroy(c);
+
+  result = true;
+  return ok();
+}