Multiple device batch for IoTDBSession 0.13

[liyuheng55555]

Main changes:

1. Add a configuration item called DEVICE_NUM_PER_WRITE to specify the of devices allowed in a batch.
2. Add a new interface called IBatch to replace the original Batch.
3. Implement a new class called MultiDeviceBatch that implements the IBatch interface.
4. Add logic to generate MultiDeviceBatch.
5. Implement write operations to MultiDeviceBatch in the IoTDBSession class (now only 0.13).