Implement paddle.min/paddle.max for 0-size tensors along non-zero dimensions

[aquagull]

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Description

为paddle.max、paddle.min支持 指定axis为非零轴的0-size tensor输入。
以numpy为例

data = np.random.random([0, 2, 3])
res = np.max(data, axis)

1. axis = (0, )

ValueError: zero-size array to reduction operation maximum which has no identity

2. 指定 axis = (1, ), keepdims = False

shape:(0, 3), val: []

3. 指定 axis = (2, ), keepdims = False

shape:(0, 2), val: []

4. 指定 axis = (1, 2), keepdims = False

shape:(0,), val: []

5. 指定axis = (2, ), keepdims = True

shape:(0, 2, 1), val: []

6. 指定axis = (1, ), keepdims = True

shape:(0, 1, 3), val: []

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