Rewrite NewRelicTrace to support fiber stops/starts #2752

Job	Run time
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	3m 5s
javascript_test	28s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	3m 16s
lint	1m 31s
mongodb_test (gemfiles/mongoid_6.gemfile)	4m 56s
mongodb_test (gemfiles/mongoid_7.gemfile)	5m 12s
system_tests	1m 54s
test (Gemfile, 3.4)	2m 54s
test (Gemfile, 2.7)	5m 0s
test (gemfiles/rails_7.0.gemfile, 3.1)	3m 25s
test (gemfiles/rails_master.gemfile, 3.2)	3m 57s
test (gemfiles/rails_7.0.gemfile, 3.2)	3m 27s
test (gemfiles/rails_7.1.gemfile, 3.3)	3m 31s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	3m 40s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1)	3m 44s
	50m 0s

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