feat: add default privileges to _pico_privilege for new users
Summary
grant default tarantool privileges to user after creating:
- execute on public
- session and usage on universe
- alter on himself
Close #385 (closed)
Ensure that
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New code is covered by tests -
API is documented -
Changelog is up to date -
(if Lua API changed) Lua API version is bumped inluamod.rs
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(if necessary) A follow-up doc issue is created in picodata/docs and linked here