Feature: Support custom args for actions

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

With the introduction of custom key-bindings in version 3.4, it's a good time to start considering how we want to implement support for custom arguments in actions.

### Requirements

- [ ] Adjust actions to support custom args
- [ ] Support adding args via the actions page
- [ ] Support variables (eg `{CurrentDirectory}`)

### Use cases for this feature
- Apply tag by specifying a tag name
- Open item in program
- Open path
- Open tab
- Create item with specific file extension
- Create shortcut #15557
- Focus specific tab in Info Pane #16045

### Files Version

v3.3

### Windows Version

Windows 11

### Comments

_No response_