[ENH] Add cache/memoization to PVcell properties (#121)#123

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kandersolar wants to merge 9 commits intoSunPower:masterfrom

kandersolar:pvcell_cache

Commits on Apr 1, 2020

test out PVcell caching mechanism
kandersolar
committed

Commits on Apr 29, 2020

make the cache dict an instance attribute instead of class attribute, oops
kandersolar
committed
add cache test; update cached decorator to be mock friendly
kandersolar
committed

Commits on May 30, 2020

Commits on May 31, 2020