Introduce graph rewrite for mixture sub-graphs defined via `IfElse` Op#169

Draft

larryshamalama wants to merge 2 commits intoaesara-devs:mainfrom larryshamalama:ifelse-mixtures

+152-29

Commits on Dec 17, 2022

Identifying mixture sub-graphs defined with an IfElse Op
larryshamalama
committed
Allow vector-valued indices for switch/ifelse mixture sub-graphs
larryshamalama
committed