Introduce new stream order_shipping_lines

[prijendev]

Description of change

• Add order_shipping_lines as a new stream.
• shippingLine is a nested object within the orders stream. It represents individual shipping methods or carrier options associated with an order. It represents multiple shipping options or methods. This new stream introduction would,
  • Optimize performance by keeping the orders query lighter.
  • Reduce the risk of API throttling due to lower query complexity.
  • Enable independent handling of shippingLines for future customizations and enhancements.

QA steps

• automated tests passing
• Run the discover mode and validate the schema/metadata in the catalog
• Run the sync mode with/without state and validate the state/records.
• Validate the fields in the sync for order_shipping_lines stream.

Risks

Rollback steps

• revert this branch

AI generated code

https://internal.qlik.dev/general/ways-of-working/code-reviews/#guidelines-for-ai-generated-code

• this PR has been written with the help of GitHub Copilot or another generative AI tool

[sgandhi1311]

Is this line in changelog misleading?