Move action execution related code to campaigns package #230
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Opinions on this?
I think the code related to campaigns-specific functionality was sprawling and moving it to its own package makes API boundaries and dependencies clearer.
This is a first step that very stupidly capitalizes identifiers to export them and passes dependencies into the package (
cfg.Endpoint,cfg.AccessToken). If we're happy with having a separate package, we can rename things (which we'll do anyway with the new flow) and possibly create other subpackages.(Stacked on top of #229)