Respect the type of click event during node selection in tree views on plugin side

[vzhukovs]

Description

There is a problem, in concrete case it reproduces with Kubernetes Plugin.
When user opens Kubernetes Explorer and goes into specific nodes, for example to see configuration maps and select it with right click to call the context menu, the plugin side doesn't respect type of mouse click event and in any case call procedure to open selected node. This can be shown in rpc calls from plugin side:

"{"kind":"data","id":15,"content":"{\"jsonrpc\":\"2.0\",\"id\":18,\"method\":\"postMessage\",\"params\":\"[\\\"{\\\\\\\"hostID\\\\\\\":\\\\\\\"main\\\\\\\",\\\\\\\"type\\\\\\\":2,\\\\\\\"id\\\\\\\":\\\\\\\"32\\\\\\\"}\\\",\\\"{\\\\\\\"hostID\\\\\\\":\\\\\\\"main\\\\\\\",\\\\\\\"type\\\\\\\":1,\\\\\\\"id\\\\\\\":\\\\\\\"85\\\\\\\",\\\\\\\"proxyId\\\\\\\":\\\\\\\"DocumentsMain\\\\\\\",\\\\\\\"method\\\\\\\":\\\\\\\"$tryOpenDocument\\\\\\\",\\\\\\\"args\\\\\\\":[{\\\\\\\"$type\\\\\\\":1,\\\\\\\"data\\\\\\\":\\\\\\\"k8smsx://loadkubernetescore/configmap-game-config.yaml?value%3Dconfigmap%2Fgame-config%26_%3D1554365947271\\\\\\\"},null]}\\\"]\"}"}"

Plugin side should respect the right click and show only the context menu, instead of force setting up global selection and fire procedures to open selected node.