feat: Use a ReadOnlyStore for returning policy data#89
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This prevents unnecessarily copying all rules when trying to read data
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This prevents unnecessarily copying all rules when trying to read data.
A new Store was created every time data was read, to prevent the in-memory store to be modified outside of the rules storage class, but this results in copying all policies every time data is read which is quite inefficient. This PR resolves this by introducing a new ReadOnlyStore, which retains all functions of an N3 Store that do not modify the Store in place.
Some casts were done in the BaseController to make this work, which are not ideal but that entire class is not ideal in general anyway.