Only create channels / features for the features that the user has requested

[lawrence-forooghian]

We’re meant to only create these if the user has requested the feature (i.e. by passing an options object for that feature). Else I guess users might end up paying for features they didn’t request.

Not sure if there's a spec point for this, but it's something we need to implement.

Whilst we're in this area, think about @umair-ably’s comment in #103 (comment) about avoiding force unwrap when passing channel to feature.

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