WebSocket EOperation and IProgressMonitor parameter

[pvlasov]

For long-running EOperations add support of WebSocket creation (leverage existing websocket routing functionality). Create an instanceof IProgressMonitor which would send/receive commands over the WebSocket (look for simple message interface in the existing code/examples). On the browser side have a promise backed by the web socket and wired to the progress monitor methods. Maybe have a standard operation invocation page displaying the monitor, cancel button, and the result when the monitor is done.

Something like this:

1. Input form submit button disables the form, creates a web socket and makes the progress bar and log item list visible.
2. Progress notifications are dispatched to the progress bar (completion percentage) status well (current task/subtask) or log items list depending on progress notification type attribute.
3. When the promise is resolved or rejected the result or rejection message are displayed.