feat(v2/callctx): add new callctx package #291
Merged
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Add a new callctx package to gax to facilitate adding and retrieving values from context.Context that our libraries can use to share information throughout the call stack. The first addition to this package will be two APIs to allow users to set RPC headers that will be added to API requests our clients make.
A follow up PR will be made to add using these after these changes are merged with #290.