[Mammoth] Move ipc calls to separate folder mammoth.

lib/mammoth/ipc/port_client.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <glacier/status/error_or.h>
+#include <glacier/string/string.h>
+#include <stdint.h>
+#include <zcall.h>
+
+class PortClient {
+ public:
+  PortClient() {}
+  static PortClient AdoptPort(z_cap_t port_cap);
+
+  template <typename T>
+  z_err_t WriteMessage(const T& obj, z_cap_t cap);
+
+  glcr::ErrorCode WriteString(glcr::String str, z_cap_t cap);
+
+  z_cap_t cap() { return port_cap_; }
+
+  bool empty() { return port_cap_ == 0; }
+
+ private:
+  z_cap_t port_cap_ = 0;
+
+  PortClient(z_cap_t port_cap);
+};
+
+template <typename T>
+z_err_t PortClient::WriteMessage(const T& obj, z_cap_t cap) {
+  return ZPortSend(port_cap_, sizeof(obj), &obj, 1, &cap);
+}