WebPageDetails.server shouldn't be constrained to a hostname

[cluby-adobe]

What are the schemas that are affected by the issue

context/webpagedetails

What are examples of products that are impacted by the issue

Adobe Analytics
Possibly other Adobe Experience Cloud solutions

https://github.com/adobe/xdm/blob/master/schemas/context/webpagedetails.schema.json#L40

The xdm:server field of context/wedpagedetails should be a simple string and not constrained to a hostname because the usage needs to support using both a name of a server vs the raw hostname as well as the name of a cluster of servers logically presented as one server.

The purpose of this field was to cover the Adobe Analytics server field which is not constrained to a hostname format.