Fix: Unnecessary Re-rendering

[li-xin-yi]

Change

1. Use lazy eval function instead of accessing pods directly. So the components using pod/pods will not re-render when any value changes in pods.
2. Memorize MyMonaco component with only id and gitvalue property. Prevent force rendering from parent components.
3. Clean up auto layout function for codeNode.

The following work later if available:

1. ResultBlock will be re-rendered when its parent codeNode was dragged. I think we can also memo it and set the execution number like out[num] in (Pod UI improvements #55) as a prop to force re-rendering it only when the result changes. I just remained it as origin, please consider combining this issue when implementing the execution number.

close #51

[lihebi]

Thanks!