Fix/no order chipper elements

[benjats07]

This code can't be executed with the current version of unstructured-inference due a lack of coordinates on Picture elements produced by Chipper.
However, those elements shouldn't be ordered at all, so the fix is to skip ordering when Chipper is used.

After this PR is merged this code is correctly executed.

from unstructured_inference.inference import layout
from unstructured_inference.models.base import get_model

file = "sample-docs/recalibrating-risk-report.pdf"
model = get_model("chipperv1")
doc = layout.DocumentLayout.from_file(
    file,
    model,
)

print(doc)

[ajjimeno]

LGTM!