Bump rubocop-rspec, add rubocop-rails, rubocop-perfomance, and rubocop config

rfb11requested to merge
rubocop-rspec-2.x into main

Adds rubocop-rails, rubocop-performance, and an initial rubocop configuration. Bumps rubocop-rspec from 1.44.1 to 2.8.0.

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