warn when using `xi:include` without `xmlns:xi="http://www.w3.org/2001/XInclude"`

[StevenClontz]

Just bit me today: an <xi:include/> is happily ignored without the namespace declaration in every file of the project. I think we should warn every project that doesn't declare the xi namespace that xi:includes won't work, and throw an error when an xi:include is used without the xi namespace.

[StevenClontz]

https://github.com/TeamBasedInquiryLearning/library/actions/runs/10168844289/job/28126187184

[oscarlevin]

This would be a good addition to the lints.

…

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