Add pyrefly and pyrefly-docs configuration

[adamtheturtle]

Add pyrefly type checker and pyrefly-docs hooks to pre-commit configuration.

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Note

Introduces pyrefly checks and tightens JSON parsing types to align with stricter type checking.

• Adds pyrefly and pyrefly-docs hooks to .pre-commit-config.yaml (pre-push) and includes pyrefly in dev dependencies in pyproject.toml
• Updates src/vws/vws.py to explicitly cast API response fields when building TargetRecord, TargetSummaryReport, and DatabaseSummaryReport (e.g., bool, int, float, str)

^{Written by Cursor Bugbot for commit 495f004. This will update automatically on new commits. Configure here.}