Add sampling support for get_policy_events_* methods (#50)
Add sampling support for get_policy_events_* methods (#50)

* Add support for sampling parameter when retrieving policy events

When sampling parameter is present in context and has a value, use it for
building the URL

* Add a sampling parameter to get_policy_events_duration method

With sampling support I'm able to keep consistency with UI policy event
timeline.

*  Add a sampling parameter to get_policy_events_range method

 This is the same case that get_policy_events_duration: With sampling
 I'm able to keep consistency with UI policy event timeline.

draios/python-sdc-client,draios/python-sdc-client