Add rudimentary default resolver tracker #61

Job	Run time
system_tests	1m 10s
test (gemfiles/rails_7.0.gemfile, 3.2)	1m 57s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	2m 9s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 19s
javascript_test	31s
mongodb_test (gemfiles/mongoid_8.gemfile)	1m 57s
mongodb_test (gemfiles/mongoid_9.gemfile)	1m 58s
lint	23s
test (Gemfile, head)	1m 42s
test (gemfiles/rails_7.0.gemfile, 3.1)	1m 49s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1, 1)	2m 29s
test (Gemfile, 2.7)	1m 41s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 35s
test (gemfiles/rails_7.1.gemfile, 3.3)	2m 7s
	24m 47s

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