Add initial luacheck config

Directories with Lua source code are now excluded because luacheck found
warnings and errors there. Some of these directories will be included as
these errors are fixed in subsequent commits.

Part of #4681

Reviewed-by: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>
Co-authored-by: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>