Add "Flash on page change"

[Skytowz]

Describe your suggested feature

I am a reader on E-Ink, I switch on J2K for the double page features, but I saw that there is not the Flash on page that's on Mihon/Tachiyomi, and I wonder if this is possible to add it please

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 issue.
• [X] I have written a short but informative title.
• [X] If this is an request for a feature in the original Tachiyomi, I am opening because multiple versions of TachiyomiJ2K have been released without this feature.
• [X] If this is an issue with an extension, or a request for an extension, I should be opening an issue in the extensions repository.
• [X] I have updated the app to version 1.7.4.
• [X] I have checked through the app settings for my feature.
• [ ] I have admitted that I am a clown by having checked this box, as I have not read these acknowledgements.
• [X] I will fill out all of the requested information in this form.