[typespec-python] Support paging for xml

Tried to generate with the blob storage spec and ran into an issue with the generator, seems it has an issue with the definition of a paged operation. I think it might be due to some uncommon behavior that the blob spec defines, but that's just a guess. Sharing the error output below.

Command used (with latest main of the python repo): tsp-client init -c https://github.com/Azure/azure-rest-api-specs/blob/0fb24e5a13f2eaa86af724acef4b725d0b3d0ca7/specification/storage/Microsoft.BlobStorage/tspconfig.yaml

**Maybe** this issue is related to the paging implementation in storage: [[Bug]: current `PagingOperation` output does not support pageable decorator in nested properties · Issue #5208 · microsoft/typespec](https://github.com/microsoft/typespec/issues/5208)

[blob-error.txt](https://github.com/user-attachments/files/20914838/blob-error.txt)

cc @msyyc @tadelesh @iscai-msft