Feature Idea: `perl -n` / `perl -p` style  run/eval command

Akin to wrapping the entire file/expression in `&rl 0` from `stdin` and (in case of `-p`), `&p`.

For example, for a file `foo.txt` with contents
```
Hello World
Foobar
Bye!
```

running `uiua eval -p '⌵' < foo.txt` should print:

```
HELLO WORLD
FOOBAR
BYE!
```

Would allow using uiua as a scripting replacement for tools like sed, perl, awk, etc...