added httpx opentelemetry adapter #1979

Job	Run time
mysql / mysql2 / ubuntu-latest	1m 34s
kafka / racecar / ubuntu-latest	11m 41s
mysql / trilogy / ubuntu-latest	1m 7s
postgresql / pg / ubuntu-latest	3m 37s
kafka / rdkafka / ubuntu-latest	12m 8s
postgresql / que / ubuntu-latest	2m 16s
kafka / ruby_kafka / ubuntu-latest	4m 38s
rabbitmq / bunny / ubuntu-latest	1m 5s
redis / redis / ubuntu-latest	1m 44s
other / dalli / ubuntu-latest	2m 55s
redis / resque / ubuntu-latest	1m 52s
other / mongo / ubuntu-latest	2m 21s
redis / sidekiq / ubuntu-latest	4m 58s
	51m 56s

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