Toolbox and flyout metrics should report appropriate height and width

[alschmiedt]

Is your feature request related to a problem? Please describe.
getMetrics returns the following information for a flyout and a toolbox:

• flyoutWidth,
• flyoutHeight,
• toolboxWidth,
• toolboxHeight,

When there is a vertical toolbox or flyout the height is equal to 0. Similarly, when there is a horizontal toolbox or flyout the width is equal to 0.

Describe the solution you'd like
For the toolbox and flyout metrics to accurately report the actual height and width of the flyout.

Describe alternatives you've considered
Keep it as is and continue to return 0.

Additional context
This would mostly include looking into where this value is being used and making sure we don't break anything by updating this.
I don't think this would break a lot of people, but it is worth it to note that this is an api change.