OnCallPagingApi Missing endpoint to list pages

[mbovo]

Describe the bug OnCallPagingApi has methods to Escalate, Acknowledge, Resolve or Create On-Call Pages but not to list them. The only way to list them is through the web ui https://app.datadoghq.eu/on-call/pages

To Reproduce Steps to reproduce the behavior:

1. Try out the example for acknowledging an on-call page found here
2. Try to change the code to list current triggered pages
3. No methods or api endpoints exposed for that.

Expected behavior A method similar to acknowledge_on_call_page but for listing outstanding pages, with the ability to filter out by responder, status, etc...

Screenshots

Environment and Versions (please complete the following information):

• datadog-api-client==2.41.0

Additional context The web UI is currently using an unstable API endpoint that differs from what the library is using ie:

• The library: https://github.com/DataDog/datadog-api-client-python/blob/22e917aa5ba86e8dbd8f4f3b4b211c565138e615/src/datadog_api_client/v2/api/on_call_paging_api.py#L32
• The web UI: https://app.datadoghq.eu/api/unstable/on-call/pages

If the endpoints is unstable the expected behavior is to have it supported under the unstable feature flag

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