## Summary of the Pull Request
Some people wish to use Ctrl+Alt combinations without Windows treating those as an alias for AltGr combinations. This PR adds a new `altGrAliasing` setting allowing one to control this behavior.
## PR Checklist
* [x] Closes#6211
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [x] Manual testing
* [x] Requires documentation to be updated: https://github.com/MicrosoftDocs/terminal/issues/50
* [x] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx
## Validation Steps Performed
* Choose a German keyboard layout
* Using `showkey -a` ensured that both `Ctrl+Alt+Q/E` and `AltGr+Q/E` produce `@/€`
* Added `"altGrAliasing": false` to the WSL profile
* Using `showkey -a` ensured `Ctrl+Alt+Q/E` now produces `^[^Q/E` while `AltGr+Q/E` continues to produce `@/€`