feat: extend C box API with new user methods

Introduce new methods:

1. box_user_id_by_name - get the user identifier by name;
2. box_effective_user_id - get current effective user identifier;
3. box_session_user_id - get current session user identifier;
4. box_session_su - change current session user;

Current MR is a part of the task to provide authentication for the cluster-wide sql in picodata. Next steps: wrap current API with tarantool module and use inside sbroad rust code to check permissions.

See also:

• picodata/picodata/sbroad#492
• picodata/picodata/picodata#339

requested review from @rosik

assigned to @darthunix

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I suggest also including it in 2.11.0-picodata branch. Also it looks clear enough to propose it to the upstream.

requested review from @funbringer and removed review request for @rosik

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At the moment box_session_user_id() returns the current session user (that can be changed by the su or setuid). There is also an "effective" user that is binded to the fiber and can't be changed by su/setuid. I think I should expose it as well (we extract it via Lua in storrage.rs of tarantool module).

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LGTM, but we need one more review

requested review from @Gerold103 and removed review request for @funbringer

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@Gerold103 does box_fiber_user_id look like a good name, or I should rather change it to box_effective_user_id?

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