[ruby-core:114100] [Ruby master Feature#19351] Promote bundled gems at Ruby 3.3

Issue #19351 has been updated by hsbt (Hiroshi SHIBATA).

Description updated

https://github.com/ruby/ruby/pull/7436 is working fine to load bundled gems without Gemfile declaration.

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Feature #19351: Promote bundled gems at Ruby 3.3
https://bugs.ruby-lang.org/issues/19351#change-103776

* Author: hsbt (Hiroshi SHIBATA)
* Status: Assigned
* Priority: Normal
* Assignee: hsbt (Hiroshi SHIBATA)
----------------------------------------
In Ruby 3.2, the default gems and bundled gems are changed only adding `syntax_suggest`. I and some committers are considering promote default gems to bundled gems again for Ruby 3.3+.

We hope to keep the current developer experience with dependency resolution and ignore the additional work like "Put gem "xxx" into your Gemfile" for developers.

### Proposal

We propose the following libraries will promote default gems to bundled gems at Ruby 3.3. They are not the dependencies of Rails and RubyGems/Bundler.


```
abbrev
getoptlong
observable
resolv-replace
rinda
nkf (C-ext)
syslog (C-ext)
```

Update: I removed `optparse` and `un` from above list. Because they are used by Ruby build process.

```
optparse
un
```

Update 2: I also removed the following libraries. `resolv` and `fcntl` are used by test of Ruby internal like `test_io.rb`. And we don't have built process of C extension at Windows platform. I gave up to extract `win32ole` in this time.

```
resolv
fcntl (C-ext)
win32ole (C-ext)
```

### Additional works

I also propose to promote rails dependencies without rubygems/bundler deps:

```
drb
mutex_m
```

Update: `delegate` is used by `tempfile`. We need to keep `delegate` as default gems for build process. and I added `reline` into above list.

Update 2: The following libraries used by tests of `ruby/ruby` and other libraries like psych. I need to remove their dependency from `ruby/ruby`.

```
base64
benchmark
forwardable
ipaddr
irb
reline
ostruct
rdoc
singleton
tsort
weakref
bigdecimal (C-ext)
date(datetime) (C-ext)
```


And gems maintained by @kou 

```
csv
```

Following gems also maintained by @kou, but they are used on RubyGems/Bundler or MJIT. Maybe, We couldn't promote them because RubyGems/Bundler couldn't bundle C-ext gems.

```
fiddle (C-ext): used by MJIT
stringio (C-ext) used by RubyGems/Bundler
strscan (C-ext) used by RubyGems/Bundler
```

But if we promote them to bundled gems, many of users need to add like `gem "csv"` into their Gemfile. I'm considering to avoid this situation.

Can we introduce the specific feature of bundled gems to RubyGems or Bundler? Example, bundler have allowed list for bundled gems. So, listed gems could be require without Gemfile under the bundle exec.



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