整理stream处理流程，适应KNI接口定义。

platform/include/internal/proxy.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <tfe_stream.h>
+#include <event2/event.h>
+
+struct tfe_proxy;
+struct tfe_proxy_accept_para
+{
+	/* Both upstream and downstream FDs */
+	evutil_socket_t upstream_fd;
+	evutil_socket_t downstream_fd;
+
+	/* Session Type */
+	enum tfe_session_proto session_type;
+};
+
+struct tfe_proxy * tfe_proxy_new(const char * profile);
+int tfe_proxy_fds_accept(struct tfe_proxy * ctx, const struct tfe_proxy_accept_para * para);
+void tfe_proxy_run(struct tfe_proxy * proxy);