update session manager interface definition; define ex_data interface; delete the event design

src/session_manager/session_utils.cpp

@@ -0,0 +1,55 @@
+#include <stddef.h>
+
+#include "session_internal_types.h"
+
+
+const char *session_get_name(const struct stellar_session *session)
+{
+	return nullptr;
+}
+
+uint8_t session_get_direction(const struct stellar_session *session)
+{
+	return SESSION_DIR_DOUBLE;
+}
+
+uint8_t session_get_current_direction(const struct stellar_session *session)
+{
+	return SESSION_DIR_C2S;
+}
+
+uint64_t session_get_createtime_ms(const struct stellar_session *session)
+{
+	return 123456778;	
+}
+
+uint64_t session_get_lasttime_ms(const struct stellar_session *session)
+{
+	return 123457890;
+}
+
+enum session_type session_get_type(const struct stellar_session *session)
+{
+	return SESSION_TYPE_TCP;
+}
+
+struct stellar_packet *session_get_packet(struct stellar_session *session)
+{
+	return nullptr;
+}
+
+enum session_state session_get_state(struct stellar_session *session)
+{
+	return SESSION_STATE_ACTIVE;
+}
+
+const char *session_get_payload(struct stellar_session *session)
+{
+	return nullptr;
+}
+
+size_t session_get_payload_length(struct stellar_session *session)
+{
+	return 0;
+}
+