Add sync --dump-payload option #2563

Job	Run time
lint	39s
mongodb_test (gemfiles/mongoid_6.gemfile)	1m 54s
javascript_test	28s
postgres_test (gemfiles/rails_master.gemfile, 3.3, 1)	1m 56s
mongodb_test (gemfiles/mongoid_7.gemfile)	1m 56s
postgres_test (gemfiles/rails_7.1_postgresql.gemfile, 3.3)	1m 49s
system_tests	1m 1s
test (Gemfile, 3.2)	1m 42s
test (Gemfile, 2.7)	1m 42s
test (gemfiles/rails_7.0.gemfile, 3.1)	1m 52s
test (gemfiles/rails_master.gemfile, 3.2)	2m 33s
test (gemfiles/rails_7.0.gemfile, 3.2)	2m 6s
test (gemfiles/rails_7.1.gemfile, 3.3)	2m 4s
test (gemfiles/rails_master.gemfile, 3.3, 1)	2m 24s
test (gemfiles/rails_master.gemfile, 3.3, 1, 1)	2m 40s
	26m 46s

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