v2: consider reworking timeout value

[DifferentialOrange]

crud operations timeout is an optional uint:

go-tarantool/crud/options.go

Line 235 in a664c6b

Timeout OptUint

yet it is not forbidden to request a float timeout for a crud operation (for example, it is the only way to set 100 ms timeout).

[oleg-jukovec]

Ok, we could to change it.