Add more conservative buffer allocation strategy in datastore buffers.

This should greatly reduce the memory footprint of multi-value attribute vectors
which uses an array store for underlying values.

The size of a new buffer is calculated as (simplified):
  *) before: (size of previous buffer) * 2
  *) now:    (size of all previous buffers) * allocation grow factor (default = 0.2)

In addition we now support resizing of all buffers, not only the first one.

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