[ruby-core:103803] [Ruby master Feature#17859] Start IRB when running just `ruby`

Issue #17859 has been updated by chrisseaton (Chris Seaton).


A compromise could be a warning - TruffleRuby warns when standard in is a terminal, but otherwise works as normal. As TruffleRuby is often used in a polyglot context, we do find this trips people up a lot if they aren't used to Ruby. And as it's just sitting there silently waiting for input, they've no idea what's going on and they wait.

```
[ruby] WARNING: truffleruby starts IRB when stdin is a TTY instead of reading from stdin, use '-' to read from stdin
```

----------------------------------------
Feature #17859: Start IRB when running just `ruby`
https://bugs.ruby-lang.org/issues/17859#change-91918

* Author: deivid (David Rodr刕uez)
* Status: Open
* Priority: Normal
----------------------------------------
Compare python:

```
$ python
Python 3.8.3 (default, Jul  8 2020, 16:49:12) 
[GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
```

To ruby:

```
$ ruby
# just hangs
```

I think firing up a console it's a good default behaviour for beginners.



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