PoC: Optimize predicate methods with `attr_reader` #2483

Job	Run time
javascript_test	26s
lint	1m 12s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 47s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	1m 40s
mongodb_test (gemfiles/mongoid_7.gemfile)	1m 53s
system_tests	58s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	1m 44s
test (Gemfile, 3.2)	1m 18s
test (Gemfile, 2.7)	1m 39s
test (gemfiles/rails_7.0.gemfile, 3.1)	1m 31s
test (gemfiles/rails_master.gemfile, 3.2)	1m 56s
test (gemfiles/rails_7.0.gemfile, 3.2)	1m 31s
test (gemfiles/rails_7.1.gemfile, 3.3)	1m 44s
test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 9s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 1s
	23m 29s

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