Add podman `is_infra` and `namespace` fields to `Container` object #2613

Job	Run time
build-linux-lint	11s
build-windows	1m 42s
build-linux-test-other	42s
build-linux-test-component (buildx)	2m 21s
Render docs	1m 14s
build-linux-test-component (test_compose.py)	6m 57s
build-linux-test-component (test_config.py)	42s
build-linux-test-component (test_container.py)	7m 42s
build-linux-test-component (test_context.py)	35s
build-linux-test-component (test_image.py)	1m 18s
build-linux-test-component (test_manifest.py)	34s
build-linux-test-component (test_network.py)	1m 13s
build-linux-test-component (test_node.py)	1m 7s
build-linux-test-component (test_plugin.py)	40s
build-linux-test-component (test_pod.py)	52s
build-linux-test-component (test_service.py)	2m 39s
build-linux-test-component (test_stack.py)	1m 27s
build-linux-test-component (test_swarm.py)	56s
build-linux-test-component (test_system.py)	1m 3s
build-linux-test-component (test_task.py)	45s
build-linux-test-component (test_volume.py)	56s
	35m 36s

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