Correct OneOf deserialization

[gcatanese]

Following the fix #1539, this PR updates the Mustache templates to generate the expected deserialization code.

[gemini-code-assist]

Summary of Changes

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This pull request addresses an issue with OneOf deserialization by updating the Mustache template responsible for generating the deserialization logic. Specifically, it corrects how types are matched, ensuring accurate deserialization of OneOf schemas by enforcing an exact match rather than a partial containment check.

Highlights

• OneOf Deserialization Fix: Corrected the type matching logic within the oneof_model.mustache template, changing contains to equals for precise type validation during deserialization.

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[gemini-code-assist]

Code Review

This pull request corrects the deserialization logic for oneOf schemas by using equals() for exact type matching instead of contains(). This is a good improvement for correctness. I've added a comment to further improve the robustness of the code by handling potential null values during deserialization, which could prevent NullPointerExceptions.