[Inspector UXR] Rotated text labels in layout explorer

[elliette]

This issue has been broken out of https://github.com/flutter/devtools/issues/2890

Rotated text labels

We feel the vertically rotated labels are difficult to read, requiring the user to tilt their head.

Suggestions

• Avoid having labels that require tilting your head to read them.
• Rearrange the layouts so that labels can be rearranged or repositioned to be easily readable.
• Consider the content that needs to be shown here
• Evaluate if showing “width x height” in the middle of the component would make more sense
• Evaluate clarifying the box constraints display.