WIP: Foundation Model Integration

[tarun-menta]

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Switching over OCRBuilder and EquationProcessor to use the new foundation model Also removes the need for the inline math detection model, while greatly simplifying LineBuilder

In addition, adds a special mode - --fix_lines enabling the model to re-write lines with formatting, math, or garbled text. When this flag is set, every line in the document is passed through the OCR model for potential re-writing

Pending:

• [x] Don't replace good lines, tune model
• [x] Support new tag types
• [x] Retain anchor tags when replacing lines in all cases
• [x] Fix math inside tables
• [ ] Add tests for the new functionality, replace old tests which are currently being skipped