Merge #7376

7376: bundle info prints gem metadata r=deivid-rodriguez a=orien

### What was the end-user problem that led to this PR?

Rubygems has supported [gemspec metadata](https://guides.rubygems.org/specification-reference/#metadata) since version 2.0. I think it'd be great to display this information in response to the `bundle info <gem>` command.

### What is your fix for the problem, implemented in this PR?

Added a check for `metadata`, outputting this extra information if it has been included with the gem release. For example:

```
> bundle info rspec-mocks
  * rspec-mocks (3.8.1)
	Summary: rspec-mocks-3.8.1
	Homepage: https://github.com/rspec/rspec-mocks
	Documentation: https://rspec.info/documentation/
	Source Code: https://github.com/rspec/rspec-mocks
	Changelog: https://github.com/rspec/rspec-mocks/blob/v3.8.1/Changelog.md
	Bug Tracker: https://github.com/rspec/rspec-mocks/issues
	Mailing List: https://groups.google.com/forum/#!forum/rspec
	Path: /opt/asdf/installs/ruby/2.6.5/lib/ruby/gems/2.6.0/gems/rspec-mocks-3.8.1
```

For better readability, we could align the values. However, this would mean a change to the existing info property lines (`Summary`, `Homepage`, `Path` and `Default`). Which would potentially break existing scripts that are coupled to the precise output.



Co-authored-by: Orien Madgwick <_@orien.io>

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