[Feature Request] Implement history visualization view

[bergundy]

Note: we will reuse the same panel (webview) we use for the "main panel", when the debug session starts the panel should transition to display the history.

[bergundy]

Adding some more details here. In addition to what you already have, you'll need to:

1. visualize the rest of the events
2. add a title above the list of tasks
3. filter out irrelevant workflow tasks that end with WORKFLOW_TASK_TIMED_OUT and WORKFLOW_TASK_FAILED events
4. filter out irrelevant workflow events like WORKFLOW_EXECUTION_TIMED_OUT and WORKFLOW_EXECUTION_TERMINATED
5. add a "current" class to a workflow task in the list to highlight it when it is currently being processed (needs for next steps)
6. add a handler for setting a breakpoint on a workflow task (next step as well)

For the "title" the logic is as follows:

• If the last event is WORKFLOW_EXECUTION_COMPLETED - display "Workflow execution completed in $duration" where $duration is the difference between the last event's timestamp and the first event's timestamp.
• If the last event is WORKFLOW_EXECUTION_CONTINUED_AS_NEW - display "Workflow execution continued-as-new in $duration"
• If the last event is WORKFLOW_EXECUTION_FAILED - display "Workflow execution failed in $duration"
• If the last event is WORKFLOW_EXECUTION_TERMINATED - display "Workflow execution terminated after $duration"
• If the last event is WORKFLOW_EXECUTION_TIMED_OUT - display "Workflow execution timed out after $duration"