Rewrite NewRelicTrace to support fiber stops/starts #2753

Job	Run time
javascript_test	26s
lint	16s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 42s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 8s
system_tests	53s
mongodb_test (gemfiles/mongoid_7.gemfile)	1m 45s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	2m 9s
test (Gemfile, 3.4)	1m 59s
test (Gemfile, 2.7)	1m 42s
test (gemfiles/rails_7.0.gemfile, 3.1)	2m 30s
test (gemfiles/rails_master.gemfile, 3.2)	2m 36s
test (gemfiles/rails_7.0.gemfile, 3.2)	2m 10s
test (gemfiles/rails_7.1.gemfile, 3.3)	2m 27s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 44s
test (gemfiles/rails_master.gemfile, 3.4, 1, 1)	2m 32s
	27m 59s

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