feat: majority voting sampling strategy

[yelkurdi]

Adds feature for majority voting sampling strategy

• Majority voting sampling strategy inherits from RejectionSamplingStrategy class.
• Majority voting runs on top of Mellea's sampling design, which means it supports requirements, verifiers, repairs up to an extent compatible with majority voting
• Majority voting using math_verify for math related tasks
• MBRD (Minimum Bayes Risk Decoding) using rougeL similarity for general generations
• requires adding async PR: feat: add async and streaming #137

[mergify]

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[yelkurdi]

@nrfulton should be ready for review.

• I've merged the latest main branch with support for asynchronous sampling calls.
• Majority Voting now supports concurrent asynchronous calls
• Test function fixed and supports default Ollama server

To execute the test:

uv run --with mellea test/stdlib_basics/test_majority_voting.py

[jakelorocco]

We should make sure to run the pre-commits on this PR to avoid any issues. The key changes look good. Thank you for writing the tests as well.