Update openai,anthropic,google provider types

[github-actions]

Automated update of Lingua provider types.

Providers: openai,anthropic,google

Validation

• Ran ./pipelines/generate-provider-types.sh for each requested provider
• Ran make generate-types
• Ran cargo fmt --all
• Ran cargo build --all-features
• Ran cargo clippy --all-targets --all-features -- -D warnings

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore string typing for ImageGenTool.size

ImageGenTool.size was widened from Option<String> to Option<serde_json::Value>, but the schema docs on this field still define it as WIDTHxHEIGHT string values (plus known string presets). This removes compile-time validation and allows non-string payloads (e.g., objects/numbers) to be serialized into tools[].size, which can now pass local typing but fail at provider request time. Keeping this field typed as a string (or a stricter string wrapper) preserves the provider contract and avoids avoidable runtime request errors.

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