magento/magento2#15772: Tier prices calculated on 2 decimals

[AleksLi]

Created new method \Magento\Quote\Model\Quote\Address\Item::calcRowTotal in the parent class. Actually it's more like an extended version of the \Magento\Quote\Model\Quote\Item\AbstractItem::calcRowTotal
Added extended rounding for Address Item to get more accurate calculation result

Description (*)

Fixed Issues (if relevant)

1. magento/magento2#<15772> : Price tiers calculated on 2 decimals even when prices of 4 decimals are entered

Manual testing scenarios (*)

1. Fully described in the ticket Price tiers calculated on 2 decimals even when prices of 4 decimals are entered #15772 .

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @AleksLi. Thank you for your contribution
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[orlangur]

This should be fixed in general and not in some random places. Ref: https://github.com/magento/magento2/issues/10532

[ghost]

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