fix: ws._api needs to be initialized but there's no method to do it

[reconbot]

ws._api starts undefined and the only way to instantiate api is to make an api call. This replaces the export with a getter that calls instantiateAPI() so it's always there when you ask for it and now there doesn't need to be a method to instantiate it.

An alternative would be to make a method that returns the api (and maybe eventually remove ws._api).

I notice the docs are wrong (the types are right) and will fix that however this one lands.

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