feat: renaming lines to shapes and enriching with graphics (color, filling and stroking)

[PeterStaar-IBM]

dependency on: docling-project/docling-core#507

Updates to shapes now allows for improved visualization,

uv run python ./docling_parse/visualize.py -l info -b crop_box -c line -i ./tests/data/cases/case_12.pdf -p 1 --interactive --display-text

[mergify]

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