Censor password by default and add a toggle option for showing password

[OneRandom1509]

Hey!
I've been using impala for the past few months and I've really liked it so far!
There was this one issue that was bothering me and it's the lack of the usual "password censor" when typing in the password of a wifi, which kinda bothered me. So why can't we just censor the password by default, and if the user wants to see the password, they can just press a keybind and toggle the nature of the password field.

show_password: false

show_password: true (through a keybind)

I already have an implementation of this ready in my fork and I'll be opening a PR for it soon, lmk what you think :)

[pythops]

Merged.
Thanks for the PR 🙏