Implement sign-in-with-apple template for node-typescript

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This PR adds a new sign-in-with-apple template for Node.js/TypeScript, providing the same Apple authentication functionality that was previously only available in Dart.

Features

The template implements a complete Apple Sign-In flow that:

• Exchanges authorization codes with Apple's API to obtain user ID tokens
• Creates JWT client secrets using ES256 algorithm for Apple API authentication
• Manages user accounts by creating new users or finding existing ones by ID/email
• Handles email verification automatically for Apple-authenticated users
• Generates session tokens for seamless Appwrite session creation

Implementation Details

The Node.js implementation mirrors the existing Dart version with appropriate ecosystem adaptations:

• Uses jsonwebtoken for ES256 JWT creation with Apple credentials
• Uses undici for modern HTTP requests to Apple's token endpoint
• Uses Node.js crypto module for MD5 hashing of Apple's sub claim
• Includes full TypeScript interfaces for type safety
• Follows the same user creation and verification logic as the Dart version

API Usage

Request:

{
  "code": "c361a519253b3486ea3c7ecd4e9b6903f.0.suut.3LCHm9ytku1B2v4r5IayPQ",
  "firstName": "Walter",
  "lastName": "O'Brien"
}

Response:

{
  "secret": "0cbdd4fd7638e0f3f55871adf2256f8f42f6faa01c9300e482c9a585b76611343dee8562ce4421b1cf9e9de6f8341fb2286499cb7992d02accd2dc699211008c",
  "userId": "90a5450f396c242637c39b4c39e07af4",
  "expire": "2025-07-15T00:10:21.345+00:00"
}

This enables Node.js developers to integrate Apple Sign-In authentication into their Appwrite functions with the same capabilities previously available only to Dart developers.

Fixes #333.

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