Add data sources for sysdig monitor notification channels

[bstoutenburgh]

It would be really helpful if we could have data sources for sysdig monitoring notification channels. In some of our environments we end up creating and maintaining sysdig monitor instances and their notification channels in one module and alerts get created in several other modules depending on the environment/application/etc.

The current work around is to maintain outputs from one module and use remote data sources elsewhere which is cumbersome, prone to errors and I would not be surprised if Hashicorp stops supporting it down the line.

[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

[bstoutenburgh]

Please keep open, we would still like this feature.

[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

[bstoutenburgh]

Released with v0.5.30. (pagerduty and email at least which is what we needed, feel free to keep adding more for slack and others)