Add a "See also" section to character details

[thatfiredev]

I suggest adding a "See also" section to the bottom of the Character Details screen, where users can see similar characters and click on them to see more details.

For example, looking at 'Amazo' (Superman villain), users may want to also see 'Doomsday' and 'Cyborg Superman' who are also Superman villains.

Since the API does not provide this data, we could write them down on a json file and bundle it into the app. The data would be imported into the local database when the user launches the app for the first time. We could use WorkManager to import the data.