Add support Date and Time Datatype

[Alexandr]

How do I get a date and time value from a query result?
There is no official support for date and time types,
but values can be stored in other data types.
https://www.sqlite.org/datatype3.html

[Brian Vincent]

go-sqlite-lite should have the same support for DATETIME as sqlite itself. For example, if you decide to store your datetime as the number of seconds since January 1, 1970 UTC, it'll just be up to you to convert your go time.Time to an int64 with t.Unix() and from an int64 to a Time with Time.Unix(sec int64, nsec int64).

I purposely decided not to encode any special meaning or logic into the type DATETIME since sqlite itself does not provide any special meaning to it either, and it would introduce overhead to check it's type, and it's pretty simple to convert the integer yourself.