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WIP: Do CSE manually

Isuru Fernando requested to merge isuruf/sumpy:cse into master

Expressions in sumpy has a certain structure such that if we do the CSE by hand and code it up, we can remove calling CSE. There are only 4 translate_from methods and I think I might be able to do the rest as well. Doing this by hand is as good as sumpy's CSE. For a order 25 YukawaKernel l2l expansion,

count_ops
Without CSE 44980
CSE manual 5758
CSE sumpy 5758
Edited by Isuru Fernando

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