add i-vila example

[kyleclo]

pretty much exact port from mmda. testing is fine on pdf fixtures works

import json
import os
import pathlib
import unittest

from papermage.magelib import Document, Entity, Metadata, Span
from papermage.recipes import CoreRecipe

fixture_path = pathlib.Path(__file__).parent / "tests/fixtures"

recipe = CoreRecipe()
doc = recipe.from_path(pdfpath=fixture_path / "1903.10676.pdf") 
doc = recipe.from_path(pdfpath=fixture_path / "2304.02623v1.pdf")
doc = recipe.from_path(pdfpath=fixture_path / "2020.acl-main.447.pdf")
doc = recipe.from_path(pdfpath=fixture_path / "4be952924cd565488b4a239dc6549095029ee578.pdf") 
doc = recipe.from_path(pdfpath=fixture_path / "2023.eacl-main.121.pdf")