lostisland / faraday / #4129

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Modernize RuboCop configuration and fix offenses (#1660)

- migrate from `require` to `plugins`
- remove explicit new cops in favour of `NewCops: enable`
- remove version boundaries from `rubocop-packaging` and `rubocop-performance` gems
- add and enable `rubocop-rake` gem
- auto-correct (safe only) a bunch of offenses
- manually correct "useless private scoping of constant" offences
- regen `.rubocop_todo.yml` to add remaining few complex offences

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1446 of 1523 relevant lines covered (94.94%)

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