Source Linnworks: refactor stream StockLocations

[monai]

What

This PR refactors private stream Location, which was embedded into stream StockLocation, to public stream StockLocationDetails utilizing HttpSubStream. From now on, StockLocations can be synced independently, while StockLocationDetails performs single sync of StockLocations, resulting in N+1 requests.

Recommended reading order

1. streams.py
2. source.py

🚨 User Impact 🚨

🚨🚨 This PR changes the stream StockLocations schema.

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[alafanechere]

Thanks @monai for this cool refacto, I made minor suggestions + committed the docker image version bump. Let me know if you plan to make the suggested modification, I'll publish the docker image update from my side branch.

[monai]

Thanks @monai for this cool refacto, I made minor suggestions + committed the docker image version bump. Let me know if you plan to make the suggested modification, I'll publish the docker image update from my side branch.

Thank you for review. I'm going to make changes on monday.

[alafanechere]

Thanks for the changes and this clean contrib, ready for merge! 🎉