added httpx opentelemetry adapter #2015

Job	Run time
kafka / racecar / ubuntu-latest	13m 2s
kafka / rdkafka / ubuntu-latest	10m 18s
kafka / ruby_kafka / ubuntu-latest	4m 39s
mysql / mysql2 / ubuntu-latest	1m 16s
mysql / trilogy / ubuntu-latest	1m 18s
postgresql / pg / ubuntu-latest	3m 16s
rabbitmq / bunny / ubuntu-latest	58s
postgresql / que / ubuntu-latest	1m 48s
redis / redis / ubuntu-latest	2m 20s
redis / resque / ubuntu-latest	2m 0s
other / dalli / ubuntu-latest	2m 46s
redis / sidekiq / ubuntu-latest	5m 2s
other / mongo / ubuntu-latest	2m 18s
	51m 1s

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