[ruby-core:93486] [Ruby master Feature#15975] Add Array#pluck

Issue #15975 has been reported by lewispb (Lewis Buckley).

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Feature #15975: Add Array#pluck
https://bugs.ruby-lang.org/issues/15975

* Author: lewispb (Lewis Buckley)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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Inspired by https://github.com/rails/rails/issues/20339

While developing web applications I've often wanted to quickly extract an array of values from an array of hashes.

With an array of objects, this is possible:

```rb
irb(main):001:0> require 'ostruct'
=> true
irb(main):002:0> [OpenStruct.new(name: "Lewis")].map(&:name)
=> ["Lewis"]
```

This PR adds Array#pluck allowing this:

```rb
irb(main):001:0> [ {name: "Lewis"} ].pluck(:name)
=> ["Lewis"]
```

without this PR:

```rb
irb(main):001:0> [ {name: "Lewis"} ].map { |item| item[:name] }
=> ["Lewis"]
```

Implemented here:

https://github.com/ruby/ruby/pull/2263



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