Monitoring api: Support query parameters

[symphony-soufiane]

In this PR, we added the support of query parameters to filter results.

• The list workflow instances endpoint takes the status=pending/completed/failed as query parameter. An instance is considered as failing if the last executed activity is not the end event.
• The list instance activities endpoint takes 4 possible query parameters started_before/started_after/finished_before/finished_after to filter activities in time.
• The list global variables endpoint takes two query parameters occurred_before/occurred_after to filter variables changes in time.

More changes have been done in this PR:

• When the monitoring token is not provided in the header, we return 401 instead of 400.
• Fixed 500 error in the list global variables endpoints when the provided instance id is not correct.
• Added nodeId in the activities definition, for both activities and events.
• In the list of workflow instances and workflow activities endpoints, we added a sanity check to verify that the provided instanceId belongs to the provided workflow. Otherwise an error is thrown.
• Added more tests