[Unity]Add FastMathTransform pass to Relax#15814
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This PR adds FastMathTransform pass to convert the expensive non linear functions to their fast but approximate counterparts. This pass replaces relax.nn.softmax, relax.exp, relax.erf, relax.tanh with topi.nn.fast_softmax, topi.fast_exp, topi.fast_erf, topi.fast_tanh.