feat(Datastore): Introduce Client Side Metrics #17817

Job	Run time
owlbot-yaml	1m 1s
root-pom	1m 42s
gitignore_correctness	59s
generate-readme	1m 3s
group_id_check_for_maps_libraries	7m 58s
package_name_check	1m 1s
gapic-bom	1m 39s
owlbot-py	1m 10s
	16m 33s

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