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sql: introduce sort order to key_part/key_part_def

Legacy SQL DD structs contained sort_order, defined per
index column. During integration, those structs are to be
vanished. So, introduce new field to part entity of Tarantool.
This field states for sorting order of given part in give index.
This field is ignored by Tarantool everywhere excpept for
some of nested queries in SQL.

Patch also replaces usages of SQL's stored sort order w/ this new
field.

Part of #3235

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