feat(python): add unsafe reflection rule (CWE-470) #1329

Job	Run time
build (javascript/express)	2m 10s
build (javascript/hapi)	16s
build (javascript/lang)	3m 16s
build (javascript/node)	15s
build (javascript/react)	27s
build (javascript/third_parties)	1m 57s
build (ruby/lang)	4m 6s
build (ruby/rails)	1m 38s
build (ruby/third_parties)	3m 26s
build (java/lang)	3m 2s
build (java/spring)	16s
build (java/android)	14s
build (java/third_parties)	31s
build (php/lang)	5m 0s
build (php/symfony)	56s
build (php/third_parties)	1m 8s
build (python/lang)	42s
build (go/lang)	57s
build (go/gosec)	2m 12s
build (go/gorilla)	18s
build (go/third_parties)	42s
	33m 29s

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