feat: add initial span tracing to http calls #16652

Job	Run time
root-pom	1m 41s
gitignore_correctness	39s
generate-readme	1m 0s
owlbot-yaml	57s
package_name_check	47s
gapic-bom	1m 22s
owlbot-py	47s
group_id_check_for_maps_libraries	6m 31s
	13m 44s

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