Support effect systems

[mkotsur]

• split the build into modules: core, model, effects/cats-effect
• implement support for cats-effect in effects/cats-effect
• update tests
• Implement Lambda via FLambda[Either, I, O]
• fix tests
• implement eff/Future
• implement eff/Either
• fix todos
• draw a table of Failure kind -> Behavior
• update docs
• ask for review of cats-effect in this gitter channel
• release intermediate version
• implement support for ZIO in effects/zio
• implement support for fs2 streams in effects/fs2
• fix logging in tests
• create example projects
• fix cross-compilation?
• pick a new library name?
• update docs
• deploy artifacts to mvn central
• publish a blog post

[mkotsur]

Should input be parsed asynchronously? Possibly, yes, because you may want to do something else before accessing the input, and that can improve your lambda's performance.