Move `logsumexp` to `tensor.special`

[ricardoV94]

Description

pytensor/pytensor/tensor/math.py

Lines 2843 to 2869 in b74cf3f

	def logsumexp(x, axis=None, keepdims=False):
	"""Compute the log of the sum of exponentials of input elements.
	See ``scipy.special.logsumexp``.
	Parameters
	----------
	x : symbolic tensor
	Input
	axis : None or int or tuple of ints, optional
	Axis or axes over which the sum is taken. By default axis is None,
	and all elements are summed.
	keepdims : bool, optional
	If this is set to True, the axes which are reduced are left in the
	result as dimensions with size one. With this option, the result will
	broadcast correctly against the original array.
	Returns
	-------
	tensor
	"""
	return log(sum(exp(x), axis=axis, keepdims=keepdims))