feat: WIP fill shippingInfo on setShippingMethod

[mickdekkers]

Note: this is still a bit rough, hence the draft PR. Open to feedback, though

We were having some trouble writing tests around a shipping method because cart.shippingInfo.taxedPrice wasn't populated by the mocking library. This PR aims to fix that. TBC next week

Questions

There's a couple remaining questions around edge cases:

• https://github.com/mickdekkers/commercetools-node-mock/blob/9bb75efa355dd6e5c3fa409b98125b362e08bf8b/src/repositories/cart/actions.ts#L654
  • I think the note in the zone.location field's docs answers this, can anyone confirm?
• https://github.com/mickdekkers/commercetools-node-mock/blob/9bb75efa355dd6e5c3fa409b98125b362e08bf8b/src/repositories/cart/actions.ts#L665-L666
  • The ZoneRate docs mention the shipping rates are defined by currency, but can anyone confirm is this the only differentiating factor? If so, there should be exactly one entry in the array after getShippingMethodsMatchingCart processes it, so [0] is correct

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