In case we want to define a macro that requires some keys from the struct,
@enforce_keys should have `accumulate: true`
Otherwise we cannot require some fields from a structures in multiple
places.
We could use
```
quote do
@enforce_keys [:key] ++ (Module.get_attribute(__MODULE__,
:enforce_keys) || [])
end
```
in __using__
But this way if we do `use` before our own @enforce_keys the key will get
overwritten.
If we allowed that to accumulate we could do @enforce_keys many time still
respecting all of them
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