[stm] Switch to a functional API

We make the Stm API functional over an opaque `doc` type. This allows
to have a much better picture of what the toplevel is doing; now
almost all users of STM private data are marked by typing.

For now only, the API is functional; a PR switching the internals
should come soon thou; however we must first fix some initialization
bugs.

Due to some users, we modify `feedback` internally to include a
"document id" field; we don't expose this change in the IDE protocol
yet.

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