fix(pdf_parse): improve span filtering

[myhloli]

• Refactor remove_outside_spans function to filter spans more accurately
• Add image_footnote, index, and list block types to output file documentation
• Update draw_span_bbox to use preproc_blocks instead of para_blocks
• Bump version to 0.9.0

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Modification

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Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
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