added httpx opentelemetry adapter #1965

Job	Run time
kafka / racecar / ubuntu-latest	11m 5s
kafka / rdkafka / ubuntu-latest	10m 46s
kafka / ruby_kafka / ubuntu-latest	5m 19s
mysql / mysql2 / ubuntu-latest	1m 15s
postgresql / pg / ubuntu-latest	3m 34s
mysql / trilogy / ubuntu-latest	1m 12s
postgresql / que / ubuntu-latest	1m 46s
rabbitmq / bunny / ubuntu-latest	51s
redis / redis / ubuntu-latest	2m 7s
redis / resque / ubuntu-latest	1m 47s
other / dalli / ubuntu-latest	2m 41s
redis / sidekiq / ubuntu-latest	5m 6s
other / mongo / ubuntu-latest	2m 18s
	49m 47s

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