[ruby-core:78118] [Ruby trunk Bug#12933] Add Some and Optional

Issue #12933 has been reported by Adam Pahlevi Baihaqi.

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Bug #12933: Add Some and Optional
https://bugs.ruby-lang.org/issues/12933

* Author: Adam Pahlevi Baihaqi
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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What if we have Optional and None as a class, and which we can use like this:

```ruby
have_data = Optional(5).get # returns 5
have_data = Some(nil) # raise error
have_data = Some(operation).expect("cannot be nil") # raise cannot be nil if operation returned nil
```




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