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sql: replace KeyInfo with key_def

KeyInfo is a legacy struct which was heavily used in SQL
front-end. This patch replaces all its usages w/ Tarantool's
natural key description structure called key_def.

This change is a part of data dictionary integration effort:
Tarantool indexes don't aware of KeyInfo, that is why it was
evicted.

Legacy KeyInfo memory handling was ref-counting based and now
is replaced w/ memory duplication. This state of affairs should
be improved in future.

Part of #3235

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