Zabbix 5.0 to Telegram 6.8 JS script

Provide pass message to telegram "Topic" form Zabbix custom alert.

in extend of manual: https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/media/telegram?at=release/5.0

Custom alerts, add parameters:

• HTTPProxy optional string - url to proxy
• parseMode optional string- html, markdown, markdownv2
• Topic optional integer - tread id of group chat
• Token required string - API token telegram bot
• To required integer - user/group chat_id
• Subject required string - subject of message
• Message required string - text message