Appkit+Qt+LibWeb+LibWebView: Dock inspector in browser window

[neil-ptr]

Description

This PR allows for the inspector to be docked in the window beside the web content. There are some issues with the <select/> tag dropdowns that are within the inspector but didn't address them as they were out of scope for this feature.

This PR also sets the ground work to have up, down, left, right and windowed inspector positions in a <select/> within the inspector and also have the browser remember what the last size and position that inspector was in last which I hope to follow up this PR with

Appkit

https://github.com/user-attachments/assets/fc05425e-56c9-44e1-9ad6-ef94084c5298

Qt

https://github.com/user-attachments/assets/3f7d96eb-664c-4834-8ad7-d3149e821303