Add rudimentary default resolver tracker #65

Job	Run time
system_tests	1m 10s
lint	19s
javascript_test	29s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	2m 13s
test (Gemfile, 2.7)	1m 40s
test (Gemfile, head)	1m 37s
test (gemfiles/rails_7.0.gemfile, 3.1)	1m 52s
test (gemfiles/rails_7.1.gemfile, 3.3)	1m 55s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 42s
test (gemfiles/rails_7.0.gemfile, 3.2)	1m 55s
mongodb_test (gemfiles/mongoid_9.gemfile)	1m 54s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 22s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	2m 26s
mongodb_test (gemfiles/mongoid_8.gemfile)	2m 6s
	24m 40s

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