Make it easier to see widget dimensions from the inspector

Original issue: https://github.com/flutter/flutter-intellij/issues/6759

"Lastly, I'd like to propose the addition of a dedicated tab, preferably positioned between the Layout Explorer and the Widget Details Tree, named 'Dimensions.' It would just display the width and height, providing a simpler view for those who may not require the complex layout details. This was present in the old Flutter Inspector."