Add default reader settings to sources and add automatic long strip detection

### Describe your suggested feature

Save default reader settings per source, probably in the source setting page, defaulting to global.

Add automatic long strip detection by checking if 2+ images do not meet the standard manga aspect ratio or smthn similar

### Other details

_No response_

### Acknowledgements

- [x] I have searched the existing issues and this is a new ticket, **NOT** a duplicate or related to another open or closed issue.
- [x] I have written a short but informative title.
- [x] If this is a request regarding an extension, I should be opening an issue in the extension's repository.
- [x] I have updated the app to version **[0.18.1.2](https://github.com/aniyomiorg/aniyomi/releases/latest)**.
- [x] I will fill out all of the requested information in this form.