feat: add telegram subscription

[shoom3301]

1. Get all telegram subscriptions for an account

http://localhost:1337/api/tg-subscriptions/0xfb3c7eb936cAA12B5A884d612393969A557d4307

2. Add a subscription

fetch('http://localhost:1337/api/add-tg-subscription', {method: 'POST', body: JSON.stringify({account: '0xfb3c7eb936cAA12B5A884d612393969A557d4307', data: {
  auth_date: 1715154310,
  first_name: "xxxx",
  hash: "1f2b9a99f5162f9b72b78b85c4a16d44c8f85d0a69eb4a5c50082d3fdb64b541",
  id: 11111111,
  photo_url: "......",
  username: "sssss"
}})})

3. Send notifications to telegram

http://localhost:1337/api/send-tg-notifications/0xfb3c7eb936cAA12B5A884d612393969A557d4307

[anxolin]

Nice job figuring out the hmac thing! not making too many comments as this will be cleaned up after hackathon, so all good!