Add support for event noise reduction capabilities

[t1agob]

Is your feature request related to a problem? Please describe.
In the current implementation, the Service created in PagerDuty through the Scaffolder action doesn't allow users to configure any options related to event grouping or noise reduction. Therefore, it requires one additional step on the PagerDuty console to enable it.

Describe the solution you'd like
I would like this to be configurable from the Scaffolder. Either by providing options on-screen to choose the event grouping strategy or passing it as a parameter directly on the template.

Describe alternatives you've considered
The only option now is to configure the service in PagerDuty after creating it on Backstage.

[t1agob]

Closed in #10 with release 0.2.1.