As I mentioned, I generally wouldn't recommend it because you either change line endings manually (on demand) or automatically, in which case you'd rather batch-edit many files using a commandline tool like dos2unix (or unix2dos). Other than that, you generally want to respect the original line endings used by a file so you don't cause a mess in version control software or in other software that reads a file and expects certain line endings (Windows's
notepad.exe can't handle UNIX line breaks, for example).
Add to the fact that this is a very trivial plugin and it's not very surprising that a plugin like this does not exist. Or maybe it even does exist, but you didn't find it (and I didn't even bother to look).
For encodings, there certainly are more packages, so one of them might provide what you would be looking for.