add support for datadog monitors of type event-v2 (#4457)

* add support for datadog monitors of type event-v2

See https://docs.datadoghq.com/events/guides/migrating_to_new_events_features/

* add changelog fragement for PR

* typos

* add link to PR

* minor_fetaure, not bugfix

* add to description when we added event-v2 type

* Update changelogs/fragments/4457-support-datadog-monitors-type event-v2.yaml

Co-authored-by: Felix Fontein <felix@fontein.de>

Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/4457-support-datadog-monitors-type event-v2.yaml

@@ -0,0 +1,3 @@
+---
+minor_changes:
+  - datadog_monitor - support new datadog event monitor of type `event-v2 alert` (https://github.com/ansible-collections/community.general/pull/4457)

plugins/modules/monitoring/datadog/datadog_monitor.py

@@ -15,6 +15,7 @@
 description:
   - Manages monitors within Datadog.
   - Options as described on https://docs.datadoghq.com/api/.
+  - The type C(event-v2) was added in community.general 4.8.0.
 author: Sebastian Kornehl (@skornehl)
 requirements: [datadog]
 options:
@@ -56,6 +57,7 @@
             - metric alert
             - service check
             - event alert
+            - event-v2 alert
             - process alert
             - log alert
             - query alert
@@ -222,7 +224,7 @@ def main():
             api_host=dict(),
             app_key=dict(required=True, no_log=True),
             state=dict(required=True, choices=['present', 'absent', 'mute', 'unmute']),
-            type=dict(choices=['metric alert', 'service check', 'event alert', 'process alert',
+            type=dict(choices=['metric alert', 'service check', 'event alert', 'event-v2 alert', 'process alert',
                                'log alert', 'query alert', 'trace-analytics alert',
                                'rum alert', 'composite']),
             name=dict(required=True),