Fix typing indicator API request parameter casing

[Copilot]

The typingIndicator.create() call was failing with HTTP 400 "invalid or incomplete inbound data in MDR" because request body parameters were sent with wrong casing — Twilio's REST API requires PascalCase keys, but the generated code used lowercase/camelCase.

Changes

• src/rest/messaging/v2/typingIndicator.ts: Fix request body parameter keys in both create and createWithHttpInfo methods:
  • data["channel"] → data["Channel"]
  • data["messageId"] → data["MessageId"]

This aligns with the established pattern across the codebase (e.g., channelsSender.ts already uses data["Channel"]) and appears to be a code generation oversight.

// Before (broken)
data["channel"] = params["channel"];
data["messageId"] = params["messageId"];

// After (fixed)
data["Channel"] = params["channel"];
data["MessageId"] = params["messageId"];

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Bug Report]: Typing indicator doesn't work</issue_title>
<issue_description>I have this code

const result = await this.client.messaging.v2.typingIndicator.create({
  channel: 'whatsapp',
  messageId,
});

It fails with:

RestException [Error]: invalid or incomplete inbound data in MDR
    at success (/home/alien/sites/echo/node_modules/.pnpm/twilio@5.10.7/node_modules/twilio/lib/base/Version.js:81:23)
    at process.processTicksAndRejections (node:internal/process/task_queues:103:5)
    at async WhatsappService.sendTypingIndicator (/home/alien/sites/echo/packages/bot/src/whatsapp/whatsapp.service.ts:40:22)
    at async WhatsappController.receiveMessage (/home/alien/sites/echo/packages/bot/src/whatsapp/whatsapp.controller.ts:29:5) {
  status: 400,
  code: 400,
  moreInfo: 'https://www.twilio.com/docs/errors/400',
  details: undefined
}
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes [Bug Report]: Typing indicator doesn't work #1160

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