Added MultiMatch algorithm.

[iustinsirbu13]

What does this PR do?

This is the implementation of the MultiMatch algorithm, accepted at EMNLP 2025, with SOTA results on on the NLP datasets from USB. The preprint is available on arXiv.

No additional dependencies are required. There are no breaking changes.

Fixes #253

Does your PR introduce any breaking changes? If yes, please list them.

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[iustinsirbu13]

@microsoft-github-policy-service agree