feat(medusa): Implement premises of the creation flow of an order edit

[adrien2p]

What

• Implements the admin create end point
• Service implementation of the create method and the retrieveActive as well as the totals computation
• Improve compute line items
• client
  • medusa-js api
  • medusa-react mutations hooks

Tests

• Unit tests of the create end points
• Unit tests of the service create method
• Integration tests for admin that also take into account totals computations
• client
  • medusa-js tests
  • medusa-react hooks tests

FIXES CORE-491

[changeset-bot]

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Latest commit: bb315ad

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[pKorsholm]

Remember to include changes to medusa-js and medusa-react in the pr @adrien2p

[srindom]

LGTM!