tarantool / tarantool / 13584250920

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box: introduce index covers option

It is intended to be used by memcs engine to specify columns of the
secondary index. Usage example: space:create_index('sk', {parts = {2},
covers = {5, 7}}.

Part of tarantool/tarantool-ee#893

NO_CHANGELOG=does not work with CE engines
NO_DOC=will be done EE

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