[ruby-core:114238] [Ruby master Feature#19775] Use the callback `main::const_added`

Issue #19775 has been reported by UlyssesZhan (Ulysses Zhan).

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Feature #19775: Use the callback `main::const_added`
https://bugs.ruby-lang.org/issues/19775

* Author: UlyssesZhan (Ulysses Zhan)
* Status: Open
* Priority: Normal
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In #17881, it was accepted that `Module#const_added` is called when there is a new constant added to the namespace of the module.
Since `main` can also serve as a namespace, it should also be able to use this callback.

```ruby
def const_added name
  p name
end
Foo = 1 # => :Foo
```



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