TUI improvements

[godzie44]

There much more improvements that can be maded for TUI mode:

• [x] Resize tabs (the ability to expand interested window)
• [x] Better tab switching
• [x] active line must glued to the middle of render area (thanks @jan-ferdinand)
• [x] colorize data in variables tab

[jan-ferdinand]

It would be nice if the currently “active” line, i.e., the one with the current instruction, was not glued to the bottom of the screen. Being able to see those lines of the function that are about to be executed when hitting “step” or “next” is valuable in my opinion.

This is how I solved essentially the same problem in one of my projects. This approach might not work at all in your situation; I don't know whether you have access to the ratatui Block and the relevant render area, for example.