fix: avoid cpu spinloop

[Julusian]

Giving it a try, I am seeing some very high cpu usage. This is on linux x64, I havent checked other platforms.
Simply importing the library causes node to use two whole cpu cores.

Adding a connect listener usb.addEventListener('connect', (e) => console.log(e)) drops that to one core being maxed out.

These numbers are from using REPL:

Welcome to Node.js v22.22.2.
Type ".help" for more information.
> const usb =require('usb')
undefined
> usb.usb.addEventListener('connect', (e) => console.log(e))
undefined
> 

---

I havent touched rust in a while, and havent used tokio before so is largely a 3rd revision from claude. Seems to work when adding and removing listeners for me

[thegecko]

@Julusian Thanks so much for this (first!) PR!

I'm also a rust n00b, so will check this out :)

[thegecko]

All tests pass, thanks @Julusian !

[Julusian]

Any chance of a new alpha build to be published with this?

[thegecko]

On it...

[thegecko]

usb@3.0.0-alpha.6 or usb@next

[Julusian]

Thank you! the fans in my laptop can relax now 😆

and my testing deployment is a lot calmer too