sqs-browse: added notion of workspaces in sqs-browse

Also added a tool to generate test tables

internal/sqs-browse/models/message.go

@@ -3,9 +3,9 @@ package models
 import "time"
 
 type Message struct {
-	ID       uint64
-	ExtID string
-	Queue    string
+	ID       uint64		`storm:"id,increment"`
+	ExtID    string		`storm:"unique"`
+	Queue    string		`storm:"index"`
 	Received time.Time
 	Data     string
 }