feat: translate equations to latex when running MSWord backend

[rateixei]

At the moment, equations present in MSWord documents are not exported. This PR translates the MSWord equations to latex and includes it in the text output. New test files have been added to test this feature.

Checklist:

• [ ] Documentation has been updated, if necessary.
• [ ] Examples have been added, if necessary.
• [ ] Tests have been added, if necessary.

[mergify[bot]]

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[cau-git]

@rateixei I see that the CI tests are failing, can you please re-generate the test GT? We need to see if it passes after that. Also, please rebase from main.

[cau-git]

Note: We will hold off with merging this until the design proposal for inline styles is implemented: https://github.com/DS4SD/docling/discussions/894

[PeterStaar-IBM]

@rateixei Now that we have the inline Formulas and Code, can you update this PR with using the right INLINE group?