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

test/tcp_c_api.cpp

@@ -0,0 +1,31 @@
+#include "tests.hpp"
+#include <netinet/in.h>
+#include <thespian/c/tcp.h>
+
+using namespace thespian;
+
+// simple smoke test of tcp C API: create + destroy handles and listen on any
+// port
+
+auto tcp_c_api(thespian::context &ctx, bool &result, thespian::env_t env)
+    -> thespian::result {
+  (void)ctx;
+  (void)env;
+
+  struct thespian_tcp_acceptor_handle *a = thespian_tcp_acceptor_create("tag");
+  check(a != nullptr);
+  uint16_t port = thespian_tcp_acceptor_listen(a, in6addr_any, 0);
+  // port may be zero if something went wrong; ignore for smoke.
+  (void)port;
+  thespian_tcp_acceptor_close(a);
+  thespian_tcp_acceptor_destroy(a);
+
+  struct thespian_tcp_connector_handle *c =
+      thespian_tcp_connector_create("tag");
+  check(c != nullptr);
+  // don't attempt to connect, simply exercise create/destroy
+  thespian_tcp_connector_destroy(c);
+
+  result = true;
+  return ok();
+}