Migrate `Schema` class to use `better-proto` for IO#3

Merged

benfred merged 4 commits intomainfrom refactor/schema-io

Feb 8, 2022

+1,178-288

Commits on Feb 6, 2022

Migrate Schema class to use better-proto for IO
karlhigley
committed

Commits on Feb 7, 2022

Add betterproto to requirements
benfred
committed

Commits on Feb 8, 2022