Allow a TokenResponse body to be customized #375

Job	Run time
rails_edge	46s
ruby_edge (gemfiles/rails_6_0.gemfile)	1m 35s
ruby_edge (gemfiles/rails_6_1.gemfile)	1m 30s
ruby_edge (gemfiles/rails_7_0.gemfile)	1m 38s
Ruby 2.7 (gemfiles/rails_6_0.gemfile)	1m 48s
Ruby 2.7 (gemfiles/rails_6_1.gemfile)	1m 54s
Ruby 2.7 (gemfiles/rails_7_0.gemfile)	1m 57s
Ruby 3.0 (gemfiles/rails_6_0.gemfile)	41s
Ruby 3.0 (gemfiles/rails_6_1.gemfile)	43s
Ruby 3.0 (gemfiles/rails_7_0.gemfile)	48s
Ruby 3.1 (gemfiles/rails_6_0.gemfile)	48s
Ruby 3.1 (gemfiles/rails_6_1.gemfile)	41s
Ruby 3.1 (gemfiles/rails_7_0.gemfile)	44s
Ruby 3.2 (gemfiles/rails_6_0.gemfile)	40s
Ruby 3.2 (gemfiles/rails_6_1.gemfile)	43s
Ruby 3.2 (gemfiles/rails_7_0.gemfile)	46s
Ruby truffleruby-head (gemfiles/rails_6_0.gemfile)	4m 23s
Ruby truffleruby-head (gemfiles/rails_6_1.gemfile)	4m 35s
Ruby truffleruby-head (gemfiles/rails_7_0.gemfile)	4m 40s
	31m 20s

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