Dialogflow ES adapter for Google Chat bot toolkit

Handler that forwards messages to Dialogflow ES.

Note: This is not an official Google product.

See googleworkspace/chat-framework-nodejs for general
instructions on building bots with the SDK.

Connecting Dialogflow ES to messages handlers

Use the dialogflowHandler method to create a message handler that forwards requests to Dialogflow ES. Creating the
handler requires the Google project ID and a language code (automatic detection of language not yet implemented.)

``typescript
// Respond to "@bot help"
import {dialogflowHandler} from "@google/chat-sdk-dialogflow";

bot.message(/help/, async (ctx) => {
await ctx.reply({
text: 'Here are some things you can try...'
});
});

// Forwards all other messages to dialogflow
bot.message(
dialogflowHandler({
projectId: process.env.GOOGLE_PROJECT_ID,
languageCode: 'en',
})
);
``