[3pt] Storage support for datetime values

[Gerold103]

Epic: Datetime remaining issues

Product: Tarantool
Since: 2.10.0-beta2
Root document:

• https://www.tarantool.io/en/doc/latest/book/box/data_model/#data-types
• https://www.tarantool.io/en/doc/latest/book/box/indexes (TBD)

SME: @ tsafin

Details

It's now possible to store datetime values to spaces and to create
indexed datetime fields.
Requested by @tsafin in tarantool/tarantool@3bd8702.

Docbot didn't create request because that commit tried to invent its own docbot syntax by adding an empty line before Title: line. It does not work. So here I create it manually. For details about the feature itself contact T. Safin please.

ToDo

• Add description of this new data type: https://www.tarantool.io/en/doc/latest/book/box/data_model/#data-types
• Check if the article about indexes should be somehow updated (https://www.tarantool.io/en/doc/latest/book/box/indexes)

[patiencedaur]

"планируется поддержка datetime на уровне space:format({...type='datetime')?"
@ tsafin отвечает на вопрос: "согласен, что из сериализации в messagepack не очень очевидно, что есть поддержка в спейсах box-а. и надо расписать"