Support Alert Plugin

[strahe]

Hi, I have a suggestion regarding the alertmanager that I hope we can discuss:
Currently, the alertmanager uses the PageDuty service, which has quite a few limitations for companies that already have a notification service.
Could we consider allowing the AlertTask to support plugins? For example:

Define a plugin interface:

type AlertPlugin interface {
    SendAlert(data *pdPayload) error
}

And the AlertTask structure:

type AlertTask struct {
    alertPlugin AlertPlugin
}

Then, in the creation of a new AlertTask:

func NewAlertTask(full api.FullNode, db *harmonydb.DB, cfg config.AlertingConfig) *AlertTask {
    var plugin AlertPlugin
    // Assuming there's a function loadAlertPlugin, which loads a plugin based on the configuration
    plugin = loadAlertPlugin(cfg)
    return &AlertTask{
        // Initialize other fields...
        alertPlugin: plugin,
    }
}

And in the sendAlert function:

func (a *AlertTask) sendAlert(data *pdPayload) error {
    return a.alertPlugin.SendAlert(data)
}

This way, we can define and embed a variety of options in the future.

[LexLuthr]

Sounds like a good idea. We are happy to get any feedback and code from community to improve alerting. Do you want to write up the PR?

[strahe]

Sure, I'll prepare the PR for the alerting improvement and submit it for review.

[LexLuthr]

Great! Looking forward to your PR. Thank you for helping improve Curio.

[LexLuthr]

Closing as implemented in #89