GH-768: Plugin to detect Telegram bot tokens

[Chandra158]

Please check if the PR fulfills these requirements

• [x] Tests for the changes have been added
• [x] Docs have been added / updated
• [x] All CI checks are green

What kind of change does this PR introduce?

• Feature: new plugin for Telegram bot tokens
• GH-768

Tests

• New test added for plugin
• Tested manually in local with newly created token

  {
      "type": "Telegram Bot Token",
      "filename": "test_data/test-bot.yaml",
      "hashed_secret": "c429079ee6a839ece2e7b0a6770198d8fe5ed438",
      "is_verified": true,
      "line_number": 11
  },

[Chandra158]

Is this the same as #769?

Yes, looks same as 769. Didn't see it earlier. Not sure if it is abandoned or they are still working on it. Anyway, let me know if I should close my PR.

[lorenzodb1]

@Chandra158 I don't see any update on that PR, so I'd go with this one.