[Zero-Dim] support input 0D Tensor for some unary api

[zhwesky2010]

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[Zero-Dim] support input 0D Tensor for some paddle unary api.

paddle.nn.functional.elu,
paddle.nn.functional.gelu,
paddle.nn.functional.hardsigmoid,
paddle.nn.functional.hardswish,
paddle.nn.functional.leaky_relu,
paddle.nn.functional.log_sigmoid,
paddle.nn.functional.relu,
paddle.nn.functional.relu6,
paddle.nn.functional.sigmoid,
paddle.nn.functional.softplus,
paddle.nn.functional.softshrink,
paddle.nn.functional.softsign,
paddle.nn.functional.swish,
paddle.nn.functional.tanhshrink,
paddle.nn.functional.thresholded_relu,
paddle.stanh,
paddle.nn.functional.celu,
paddle.nn.functional.mish,
paddle.nn.functional.silu,
paddle.nn.functional.tanh,
paddle.cosh,
paddle.sinh,
paddle.abs,
paddle.acos,
paddle.asin,
paddle.atan,
paddle.ceil,
paddle.cos,
paddle.exp,
paddle.floor,
paddle.log,
paddle.log1p,
paddle.reciprocal,
paddle.round,
paddle.sin,
paddle.sqrt,
paddle.square,
paddle.tanh,
paddle.acosh,
paddle.asinh,
paddle.atanh,
paddle.expm1,
paddle.log10,
paddle.log2,
paddle.tan,

[paddle-bot]

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[raindrops2sea]

LGTM