Add parse time to single fusion path

[johannessteu]

Instead of a total parse time it would be cool to see how long it took to render each fusion path

[Sebobo]

Would you consider this solved with #95
or do you mean "every" fusion path.

Of course each render time of a block with a cache config still contains the render time of it's children.
And the information starts to be less correct when subparts are read from cache.