Customizable webhooks for status updates

[johnSchnake]

Describe the solution you'd like
Allow the user to specify a series of webhooks/subscriptions which certain events will post back too. Examples:

• subscribe to overall status events (plugin starts/stops/fails or the run is over in general) (similar to Notifications #585 )
• subscribe to each progress update for each plugin (if we complete RFE: Implement progress for e2e tests #354 )
• subscribe to get the results tarball at the very end (similar to use for Allow for user ordered operations in aggregator #39 )
• a way to subscribe to get not just the status but maybe even the "results" of each plugin if such a thing is possible.

Anything else you would like to add:
Webhooks we be a pretty generic way to allow other tools to be built in/around Sonobuoy without having to vendor Sonobuoy itself and use the internal methods.

It would be great to do something like:

• launch a run in CI
• the results automatically get put into S3
• the final status gets passed to a slackbot and posted into a team channel

Implementing 1 webhook isn't much easier than supporting multiple, we just have to allow the user to specify them and then fire off the info as we get it.

[stale]

There has not been much activity here. We'll be closing this issue if there are no follow-ups within 15 days.

[vladimirvivien]

cc @wilsonehusin this maybe worth revisiting as well.

[stale]

There has not been much activity here. We'll be closing this issue if there are no follow-ups within 15 days.