Add productVariantId,orderId to OrderLine api, orderId column to OrderLine

[mschipperheyn]

Description

I cannot tell you how much time I spent on performance related issues caused by needing access to the orderId from an OrderLine without having access to the root order.

Vendure strongly assumes that orderLines and payments are accessed through the order. And normally, that's the case. However, there are a number of scenario's where you might want to access the orderId or productVariantId without loading those entities. And you might not have the root order entity handy. It's a scenario common to us.

Also, Vendure should IMHO optimize for getting all ManyToOne columns easily through GraphQL and code, without having to load the entire entity if all you need is the id. Which IS a common scenario.

I want to push another PR which addreses ALL of the columns and ManyToOne relations, but let's see how this one goes first :-)

Breaking changes

No

Screenshots

Checklist

📌 Always:

• [x ] I have set a clear title
• [x ] My PR is small and contains a single feature
• [ x] I have checked my own PR

👍 Most of the time:

• I have added or updated test cases
• I have updated the README if needed

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Dec 23, 2024 10:05pm

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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