Description of the new feature/enhancement

An extension idea would be to allow for password manager integration, for example through the command pallette or a hotkey. After searching the entry to fill out (in a command pallette-alike dropdown with search) it would then fill out the username, password, or any other field. Some password managers like 1Password already have some form of desktop integration, but it's not excellent. Native incorporation in Windows Terminal would be amazing.

Proposed technical implementation details (optional)

We will probably first need extension support for this, but then it should be relatively easy.