Use OpenSSL 3.x with Ruby 3.1.x

* Make supported openssl versions explicit per definition.

Bump openssl versions

Add picoruby-3.0.0

Add mruby-3.1.0

Prior commit attempts to shorten install by omitting documentation install,
however an additional target is needed to get the conf dirs for capturing the
PEMs et al.

* See https://github.com/openssl/openssl/issues/8170
* The install_sw target exists since 1.0.0 or earlier:
  https://github.com/openssl/openssl/blob/OpenSSL_1_0_0-stable/Makefile.org

The check to prevent deleting user files during clean_prefix_path by disallowing
installs into existing directories that weren't earlier truffleruby installs broke
asdf installs, as asdf always creates an empty directory before installing.

This fix adds a second exception to the existing directory case when that directory
is empty. The check is done via testing the length of ls output. The logic was
manually tested against non-existing directories, existing empty directories,
existing non-empty directories in general, and existing non-empty directories
that contained a file named "bin/truffleruby".

I also copied the file over my existing asdf version of ruby-build and made sure that
it successfully installed truffleruby.

- https://www.ruby-lang.org/en/news/2022/04/12/ruby-3-1-2-released/
- https://www.ruby-lang.org/en/news/2022/04/12/ruby-3-0-4-released/
- https://www.ruby-lang.org/en/news/2022/04/12/ruby-2-7-6-released/
- https://www.ruby-lang.org/en/news/2022/04/12/ruby-2-6-10-released/

Add definition for Ruby 3.2.0-preview1

Ruby 3.2.0-preview1 has been released.
https://www.ruby-lang.org/en/news/2022/04/03/ruby-3-2-0-preview1-released/

This PR specifies the same OpenSSL version (3.0.2) as 3.2.0-dev.
https://github.com/rbenv/ruby-build/blob/v20220324/share/ruby-build/3.2.0-dev#L1

Bump openssl versions