[ruby-core:79667] [Ruby trunk Feature#13241] Method(s) to access Unicode properties for characters/strings

Issue #13241 has been reported by Martin Dürst.

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Feature #13241: Method(s) to access Unicode properties for characters/strings
https://bugs.ruby-lang.org/issues/13241

* Author: Martin Dürst
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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[This is currently an exploratory proposal.]

Onigmo allows Unicode properties in regular expressions. With this, it's e.g. possible to check whether a string contains some Hiragana:

```
"ABC あ DEF" =~ /\p{hiragana}/
```

However, it is currently impossible to ask for e.g. the script of a character. I propose to add a method (or some methods) to String to be able to get such properties. Various (to some extent conflicting) examples:

```
"Aあア".script => :latin # returns script of first character only

"Aあア".script => [:latin, :hiragana, :katakana] # returns array of property values

"Aあア".property(:script) => :latin # returns specified property of first character only

"Aあア".property(:script) => [:latin, :hiragana, :katakana] # returns array of specified properties' values

"Aあア".properties([:script, :general_category]) => [[:latin, :Lu], [:hiragana, :Lo], [:katakana, :Lo]]
                        # returns arrays of property values, one array per character
```

The interface is still in flux, comments welcome!

Implementation depends on #13240.


In Python, such functionality (however, quite limited in property coverage, and not directly on String) is available in the standard library (see https://docs.python.org/3/library/unicodedata.html).



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