feat: add support for alert grouping

Description

This PR introduces the capacity to enable noise reduction through alert grouping and auto pause of notifications.

The user will be able to pass an optional parameter (intelligent, time, content_based) from within a software template and during service creation alert grouping will be enabled automatically and using recommended defaults.

Auto pause of notifications will also be enabled by default.

Issue number: #8

Type of change

[x] New feature (non-breaking change which adds functionality)
[ ] Fix (non-breaking change which fixes an issue)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

[x] I have performed a self-review of this change
[x] Changes have been tested
[x] Changes are documented
[x] Changes generate no new warnings
[x] PR title follows conventional commit semantics

If this is a breaking change 👇

[ ] I have documented the migration process
[ ] I have implemented necessary warnings (if it can live side by side)

Acknowledgement

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PagerDuty / backstage-plugin-backend