build-common_v2.0.1
[AB#5780](https://dev.azure.com/fluidframework/235294da-091d-4c29-84fc-cdfc3d90890b/_workitems/edit/5780) Create the Migration Shim `IChannel` Create the Migration Shim `IChannelFactory` This does not implement the actual methods, rather outlines the API surface. --------- Co-authored-by: Matt Rakow <[email protected]>