Update fields with Value structure type, add required `valueAddedTaxIncluded`

Procedure data fields data.value, data.minimalStep, data.contracts.value, data.bids.value, data.award.value - should be represented with [Value](structure http://dgf.api-docs.ea2.openprocurement.io/en/latest/standard/util.html#value).

Now required field valueAddedTaxIncluded of Value structure is missing.

{
    "message": {
        "minimalStep": {
            "valueAddedTaxIncluded": "Unknown field"
        }
    }
}