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feat(product-sync): add support for changeMasterVariant, refactor product sync (#272)

#### Summary
Resolves #271 

#### Description
This PR changes how we generate product update actions. Before we used `jsondiffpatch` on the whole product. Now, when syncing variants, we match variants by `id/key/sku` and diff only matched variants which are present in both old and new product.

#### Todo

- Tests
    - [x] Unit
    - [ ] Integration
    - [ ] Acceptance
- [ ] Documentation
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