Allow OST generation without class overlays

By far the most expensive part of OST generation is the retrieval of class overlays (ApexClassIdentifier objects). These are vital to the construction of a strongly-typed OST, but for a small number of massive organizations, this step may be prohibitively expensive (time and space) to run. There should be an option to generate the OST without this step to create an OST that works very well for system classes and SObjects and reasonably well for custom classes (type parameters won't be populated, some modifiers will be missing, etc., but overall class structure and simple signatures will be present).

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