[功能] 将 Microsoft Teams 添加为警报通知通道

Feature Request I would like to add Microsoft Teams as an alert notification channel to HertzBeat. I have searched the documentation, existing issues/PRs, and code, and there are no proposals or implementations related to Teams/msteams. The project already has channels such as Slack, Discord, Webhook, Ntfy, etc. #3778 / #4249 only fixes the encoding problem for the Power Automate URL with the generic Webhook, not the Teams channel. The Office 365 Incoming Webhook has been retired in 2026-05, and the new implementation should support Teams Workflows (Power Automate) webhook, send Adaptive Card, instead of the retired webhook.office.com Incoming Webhook. If the community approves, I am willing to implement and submit a PR. Before starting to write code, I would like to ask the maintainer to confirm whether they accept making an independent notification channel.