Allow user input for plugins configurations

[NilSilva]

Describe your suggested feature

A while back a wrote a komga plugin but the url is user specific. So the user should be allowed to configure the plugins. I don't know how useful this would be for other plugins... But for a komga plugin it's necessary.

Other details

The way I see this working is having a button on the plugin next to the "latest" button. That opens a new page or something with the inputs. I'm not really familiar with the code so I'm not sure what the best way of implementing this is.

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• I have written a short but informative title.
• If this is an issue with a source, I should be opening an issue in the sources repository.
• I have updated the app to version 2.0.0.
• I will fill out all of the requested information in this form.