Add ProblemSerializable

[Yuki-Imajuku]

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[Yuki-Imajuku]

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Pull Request Overview

This PR introduces ProblemSerializable, a new class that extends the Problem class to enable JSON serialization of problem data, particularly for images. The changes refactor the serialization approach using Pydantic's annotated types, creating a reusable SerializableImage type that replaces the previous manual field serializer/validator approach used in CaseResultSerializable.

Key Changes

• Introduces ProblemSerializable class with serializable image support for problem statements
• Refactors image serialization using Pydantic's Annotated type with validators and serializers
• Updates CaseResultSerializable to use the new SerializableImage type, simplifying its implementation

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
src/ale_bench/schemas.py	Adds ProblemSerializable class and SerializableImage type; refactors CaseResultSerializable to use the new type
tests/test_schemas.py	Adds comprehensive test for ProblemSerializable serialization/deserialization with images
pyproject.toml	Adds typing_extensions dependency for Annotated type support
docs/rating_and_ranking.md	Updates LaTeX notation to use underscores instead of escaped characters for readability

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