tarantool / tarantool / 18711308531

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box: populate sysview iterator with position method

Currently Tarantool crashes when one tries to use pagination on a
`sysview` space because it doesn't have `iterator_position` method
and it's even not initialized to a generic version throwing an error.
Anyway, `sysview` spaces support only `tree` indexes, so pagination
definitely may work there - let's populate this engine with
`iterator_position` method which simply calls the same method of
the underlying iterator.

Closes #11953

NO_DOC=bugfix

(cherry picked from commit ffa157d2d)

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