Add rudimentary default resolver tracker #63

Job	Run time
system_tests	1m 15s
lint	32s
test (Gemfile, 2.7)	1m 54s
test (Gemfile, head)	1m 39s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	2m 32s
test (gemfiles/rails_7.1.gemfile, 3.3)	2m 13s
test (gemfiles/rails_7.0.gemfile, 3.1)	1m 58s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 41s
test (gemfiles/rails_7.0.gemfile, 3.2)	2m 12s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	2m 34s
javascript_test	31s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 40s
mongodb_test (gemfiles/mongoid_8.gemfile)	2m 10s
mongodb_test (gemfiles/mongoid_9.gemfile)	2m 17s
	27m 8s

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