feat: add initial span tracing to http calls #16662

Job	Run time
generate-readme	40s
owlbot-yaml	53s
group_id_check_for_maps_libraries	6m 29s
gitignore_correctness	56s
owlbot-py	34s
root-pom	1m 26s
package_name_check	56s
gapic-bom	1m 13s
	13m 7s

Provide feedback