Support other webhook about openobserve HOT 7 CLOSED

It looks if we can custom message body, it should works for most IM.

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+1
And we want the Stream name to be a text field，so we can enter stream-* to match stream-2023 & stream-2022

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@loyous we have it in our backlog to add more notification destinations.

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@oasisk I have some ideas for this:

1. we provide multiple destinations, user can select one, slack or discord or etc...
2. we provide a webhook & message template, users can customise it, and this will work in most scenarios.
3. we provide destination management. Users can define destinations like slack, discord, WeChat..., then they can select one destination when they add an alert.

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being tracked as part of #204

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We are developing multiple destination support. later i will write document how to add template for Feishu, WeChat, and DingTalk notifications

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dup to #204

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