feat(medusa): refactor the way the order edit handle the items

[adrien2p]

What Re work of the order edit flow

• create
  • clone the original order item/tax_lines/adjustment and set the order_edit_id and original_item_id on the tax line
• delete
  • Remove all cloned items
• Remove computeLineItems
• Totals is based on all the items that are on the oder edit and comes from the clone
• Add support for feature flag class decorators

Concerning the add/update/remove item, it will be manage in the appropriate PR

Tests

• Update all existing tests

FIXES CORE-620

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Latest commit: e0648664f69a6553fef6dadd3daa2b8e30690978

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