ruby: remove bundled gems, add provides for default gems (#3035)
* remove bundled gems from ruby, remove spec of default
* provide default gems within ruby
* Add rake executable
* Cleanup
* Remove bundled molinillo
* Cleanup removing bundled gems
* Fix typo in versions
* Incorporate comments
* Remove ssh-key, add back cgmanifest
* Remove provides for bundler, bigdecimal
* License map, fix errors
* Incorporate comments
* fix comment, try removing patch
* Remove patches, fix license
* Fix map again
* Cleanup changelog
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