Feature: Add support for global search from any location

### What feature or improvement do you think would benefit Files?

When I press "Ctrl+F" and I'm in the search bar, pressing "Enter" lets me search the local folder. On the other hand, there's no easily accessible hotkey that allows me to search more broadly. I want to be able to press "Shift+Enter" to start a global search. That would make it faster to start a global search when I need it.

### Requirements

- Create code that starts a global search with the text in the search field as input
- Bind the "Shift+Enter" hotkey to it when the focus in on the search field.

### Files Version

3.9.9.0

### Windows Version

10.0.26100.0

### Comments

_No response_