Merge lazy resolution into Dataloader #3100

Job	Run time
system_tests	1m 11s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	2m 22s
lint	23s
test (gemfiles/rails_7.0.gemfile, 3.1)	1m 53s
test (Gemfile, 2.7)	1m 45s
test (Gemfile, head)	1m 35s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 22s
test (gemfiles/rails_7.1.gemfile, 3.3)	2m 13s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	2m 33s
test (gemfiles/rails_7.0.gemfile, 3.2)	2m 1s
mongodb_test (gemfiles/mongoid_9.gemfile)	2m 1s
mongodb_test (gemfiles/mongoid_8.gemfile)	1m 49s
javascript_test	30s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 37s
	25m 15s

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