BRAKING CHANGE: refactor render function

[kamiazya]

What was a problem

• It was unclear how to use the IContext interface, which is the second argument of the render function.

How this PR fixes the problem

Fix render and renderToDot functions

Fixed the second argument of the render function to give a cluster that will be a container instead of the IContext interface.

-function render(element: ReactElement, context?: IContext): number;
+function render(element: ReactElement, container?: ICluster): ICluster;

Fix useNode and useEdge API

Check lists (check x in [ ] of list items)

• Test passed
• Coding style (indentation, etc)

Additional Comments (if any)

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