Identify and skip development dependencies

[ParadoxV5]

There are practices to differentiate “development apps” (e.g., use Rake to automate, use RBS to test) and “runtime libraries” (e.g., Rake plugin, RBS processor) in Gemfiles and .gemspecs.

# Gemfile
group :development do
  gem 'rake', …
  gem 'rbs', …
end

# *.gemspec
…
  add_development_dependency 'rake', …
  add_development_dependency 'rbs', …
…

RBS – both rbs collection as well as when looking for sig/s in general – should learn to identify those patterns.

• Relates to Stop loading non-library RBS files #1148 (comment)

Originally posted by @ParadoxV5 in soutaro/rbs-inline#11 (comment)