feat(cloudwatch): single-click log group to view log streams #3150

Problem: 
Viewing log streams requires two steps:
1. open context menu
2. choose "View Log Stream"

Solution:
Invoke "View Log Stream" when a log group is left-clicked.

Author: gsweetwood

.changes/next-release/Feature-3082756c-79f7-4341-88be-d2f583a93686.json

@@ -0,0 +1,4 @@
+{
+	"type": "Feature",
+	"description": "CloudWatch Logs: one click to list log streams for a log group"
+}

src/cloudWatchLogs/explorer/logGroupNode.ts

@@ -8,6 +8,7 @@ import * as os from 'os'
 import { AWSResourceNode } from '../../shared/treeview/nodes/awsResourceNode'
 import { AWSTreeNodeBase } from '../../shared/treeview/nodes/awsTreeNodeBase'
 import { getIcon } from '../../shared/icons'
+import { localize } from '../../shared/utilities/vsCodeUtils'
 
 export const contextValueCloudwatchLog = 'awsCloudWatchLogNode'
 
@@ -17,6 +18,11 @@ export class LogGroupNode extends AWSTreeNodeBase implements AWSResourceNode {
         this.update(logGroup)
         this.iconPath = getIcon('aws-cloudwatch-log-group')
         this.contextValue = contextValueCloudwatchLog
+        this.command = {
+            command: 'aws.cloudWatchLogs.viewLogStream',
+            title: localize('AWS.command.cloudWatchLogs.viewLogStream', 'View Log Stream'),
+            arguments: [this],
+        }
     }
 
     public update(logGroup: CloudWatchLogs.LogGroup): void {