[api] Qualify access to `Nametab`

In general, `Nametab` is not a module you want to open globally as it
exposes very generic identifiers such as `push` or `global`.

Thus, we remove all global opens and qualify `Nametab` access. The
patch is small and confirms the hypothesis that `Nametab` access
happens in few places thus it doesn't need a global open.

It is also very convenient to be able to use `grep` to see accesses to
the namespace table.

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