Make Enum value_methods optional #2803

Job	Run time
javascript_test	30s
lint	1m 35s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	3m 26s
mongodb_test (gemfiles/mongoid_9.gemfile)	3m 19s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	3m 37s
system_tests	2m 31s
mongodb_test (gemfiles/mongoid_8.gemfile)	3m 25s
test (Gemfile, 3.4)	3m 3s
test (Gemfile, 2.7)	4m 59s
test (gemfiles/rails_7.0.gemfile, 3.1)	3m 34s
test (gemfiles/rails_7.0.gemfile, 3.2)	3m 19s
test (gemfiles/rails_7.1.gemfile, 3.3)	3m 37s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1, 1)	4m 31s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	3m 55s
	45m 21s

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