[alerter]告警转发支持指定监控类型，告警级别

[tomsun28]

Is your feature request related to a problem? Please describe.
目前告警转发是直接转发所有触发告警，常见情况是需要将指定某些告警信息转发给指定接收人。

Describe the solution you'd like
我们需要在告警转发时，支持选择配置指定转发哪些监控类型的告警，和哪个告警级别的告警信息。

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Is your feature request related to a problem? Please describe.
Currently, alarm forwarding is to directly forward all triggered alarms. In a common situation, certain alarm information needs to be forwarded to a designated recipient.

Describe the solution you'd like
We need to support the selection and configuration of alarms that specify which monitoring types to forward and which alarm severity alarm information to forward when alarms are forwarded.

[tomsun28]

support by v1.0-beat.8 https://github.com/dromara/hertzbeat/releases/tag/v1.0-beta.8