v4 task and container stats handler #2370
Merged
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Summary
This add the initials outline for the task_stats_handler and container_stats_handler.
Implementation details
This PR doesn't create a v4 metadata endpoint yet, it creates the initial task_stats_handler and container_stats_handler. In each file we specify the path that users used to query task and container stats for v4 endpoint. We reuse V3EndpointID as an unique container identifier to build the v4 path.
Testing
New tests cover the changes:
I will add tests in task_server_setup in the next PR once finish implementing task_server setup part for v4 endpoint.
Description for the changelog
Licensing
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.