Add RelationshipHookMode argument to BundleWriter::write

[eugineerd]

Objective

I've been using BundleScratch for batch writing components when synchronizing entities across worlds, it's been quite nice. However currently BundleWriter::write doesn't allow setting RelationshipHookMode, which makes it less usable for this task since it requires mapping entities when inserting relationships while also preserving ordering in RelationshipTargets (which becomes broken when running with the default RelationshipHookMode::Run)

Also BundleWriter::write was missing #[track_caller].

Solution

• Add RelationshipHookMode argument to BundleWriter::write and set all existing calls to use RelationshipHookMode::Run, which was the default passed by it when inserting components.
• Annotate BundleWriter::write with #[track_caller]

Testing

• The one existing test that used BundleWriter::write passed

[kfc35]

Not knowledgable enough to know whether the api change is worth it / if most cases should just use RelationshipHookMode::Run and not think too much about it, but the logic looks good to me