Add a way to have variable typing speed

[wizardlink]

Is your feature request related to a problem? Please describe.
I'd like a way of having variable typing speed, a range for the interval between keystrokes, to attempt to make it feel more human.

Describe the solution you'd like
I want to be able to set a variable, i.e. TypingSpeedVaried [250ms, 350ms] and have the Type actions pick a number in that range when waiting before the next input.

Describe alternatives you've considered
You can Sleep before every keystroke, but that is a very tedious process.

Thank you for the amazing tool you've given us by the way!

[J-C-B]

Hi, if you scroll to the bottom of the readme.....

https://github.com/charmbracelet/vhs?tab=readme-ov-file#set-typing-speed

Type something really slowly!
`Type@500ms "Slow down there, partner."`

Also....

Set Typing Speed

Set TypingSpeed 500ms # 500ms
Set TypingSpeed 1s    # 1s

https://github.com/charmbracelet/vhs?tab=readme-ov-file#type

[wizardlink]

I'm not looking to set a static typing speed for a Type call. What I want here is a way for VHS to change its typing speed for every character it types, within a range.