Make space.create params error less vague

Is your feature request related to a problem? Please describe.

I've tried to build a simple space for tests. It is a bit painful to debug :eval calls, and it's even more painful if error is vague.

My code was

if not box.cfg.read_only then
    local sp = box.schema.space.create(space_name, {
        {name = 'id', type = 'unsigned'},
        {name = 'bucket_id', type = 'unsigned'},
    })
    -- create index, etc...
end

and I've got an error Illegal parameters, unexpected option '1'. I've spent some time to get what's this one was about. My mistake was to call with { { name = ... } } as opts instead of { format = {{ name = ... }} }, but it wasn't obvious. Like, there is no explicit 1s in my code.

Describe the solution you'd like

I think an error message You should provide map with options instead of array or Expected opts format is { format = {...}, ... } would be more convenient to interpret.

Describe alternatives you've considered

Not sure there's any.

Additional context

I think provided info should be enough.

Definition of Done

Less vague error message is case of providing array for opts instead of a map.

Start by tracing box.schema.space.create and its options validation, focusing on the case where opts is an array rather than a map. Review how the :eval call reports the unexpected option, then verify that this input produces a message identifying the expected { format = {...}, ... } structure.