* Separated iteration through container ids from `ContainersOf()`
so that it could be reused.
* When listing containers we used to iterate through the
the whole list of containers twice: first when reading from
a contract, then when sending them. Now we can send batches
of containers when reading from the contract.
Signed-off-by: Ekaterina Lebedeva <ekaterina.lebedeva@yadro.com>
Ekaterina Lebedeva
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