feat(openai): add 'moderateContent' to ChatOpenAI for content moderation

[christian-bromann]

This PR adds support for OpenAI's Moderation API to the ChatOpenAI class, allowing users to check content for policy violations directly through the LangChain OpenAI provider.

Changes

New Method: moderateContent

Added a new moderateContent method to the BaseChatOpenAI class that provides direct access to OpenAI's Moderation API. This method:

• Accepts a single text string or an array of texts to moderate
• Supports custom moderation models (defaults to omni-moderation-latest)
• Returns detailed moderation results including flagged status, categories, and scores
• Properly handles errors using LangChain's error wrapping utilities

Usage Example

const model = new ChatOpenAI({ model: "gpt-4o-mini" });

// Moderate a single text
const result = await model.moderateContent("This is a test message");
console.log(result.results[0].flagged); // false
console.log(result.results[0].categories); // { hate: false, harassment: false, ... }

// Moderate multiple texts
const results = await model.moderateContent([
  "Hello, how are you?",
  "This is inappropriate content"
]);
results.results.forEach((result, index) => {
  console.log(`Text ${index + 1} flagged:`, result.flagged);
});

// Use a specific moderation model
const stableResult = await model.moderateContent(
  "Test content",
  { model: "text-moderation-stable" }
);

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[christian-bromann]

Moving this back to draft. If anyone is interested in this feature, please give us a ping.