feat: add initial span tracing to http calls #16634

Job	Run time
generate-readme	1m 17s
group_id_check_for_maps_libraries	6m 59s
owlbot-yaml	56s
gapic-bom	1m 35s
owlbot-py	1m 5s
gitignore_correctness	1m 8s
root-pom	1m 36s
package_name_check	57s
	15m 33s

Provide feedback