added httpx opentelemetry adapter #1978

Job	Run time
other / dalli / ubuntu-latest	3m 16s
other / mongo / ubuntu-latest	2m 53s
kafka / racecar / ubuntu-latest	14m 43s
kafka / rdkafka / ubuntu-latest	10m 27s
kafka / ruby_kafka / ubuntu-latest	4m 36s
mysql / mysql2 / ubuntu-latest	1m 16s
mysql / trilogy / ubuntu-latest	1m 50s
postgresql / pg / ubuntu-latest	3m 48s
postgresql / que / ubuntu-latest	2m 12s
rabbitmq / bunny / ubuntu-latest	55s
redis / redis / ubuntu-latest	1m 55s
redis / resque / ubuntu-latest	1m 52s
redis / sidekiq / ubuntu-latest	5m 7s
	54m 50s

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