Add top-level schema caches to Schema::Visibility for better performance #2592

Job	Run time
system_tests	1m 48s
lint	15s
javascript_test	28s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 23s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	1m 40s
mongodb_test (gemfiles/mongoid_7.gemfile)	1m 35s
test (Gemfile, 3.2)	1m 23s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	1m 33s
test (Gemfile, 2.7)	1m 7s
test (gemfiles/rails_7.0.gemfile, 3.1)	1m 54s
test (gemfiles/rails_master.gemfile, 3.2)	2m 9s
test (gemfiles/rails_7.0.gemfile, 3.2)	1m 30s
test (gemfiles/rails_7.1.gemfile, 3.3)	1m 49s
test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 5s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	1m 54s
	22m 33s

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