Function PointerSetInferFields

Helper method for generating a class that infers the field and rawField names, since TS generics are all-or-nothing, and we don't pass a value type in the constructor.

const fields = ['my', 'fields'] as const
const rawFields = ['raw'] as const
const PSClass = PointerSetInferFields(fields, rawFields)
const store = new PSClass<ValueType>(blockSize)