Rename to `where` to match numpy api

[williambdean]

pytensor/pytensor/tensor/basic.py

Lines 810 to 812 in 82bb964

	@scalar_elemwise
	def switch(cond, ift, iff):
	"""if cond then ift else iff"""

[ricardoV94]

@williambdean can we group all these similar issues under a common one? They are probably best tackled together anyway