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fix: invalid namespace completions (#5322)
This PR fixes an issue reported a while ago at https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/.60Monad.2Emap.60.20is.20a.20namespace.3F/near/425662846 where `Monad.map` was incorrectly reported by the autocompletion as a namespace. The underlying issue is that `Monad.map` contains an internal declaration `_default`. This PR ensures that no namespaces are registered that only contain internal declarations. This also means that `open`ing namespaces that only contain internal declarations will now fail. The Mathlib adaption for this is a minor change where a declaration (i.e. a namespace that only contains internal declarations) was `open`ed by accident.
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