Upper bound protobuf containers based on scalar/composite #5787
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Noticed that protobuf containers (repeated lists and maps) are bifurcated into scalar/composite, but mypy treats them identically. Here we can leverage upper bounds to further enforce the subtypes allowable by proto (primitive types / message types)
Map Keys are limited to ints and strings per https://developers.google.com/protocol-buffers/docs/proto#maps