feat(storage): add checksum validation on json read paths #19833

Job	Run time
package_name_check	1m 11s
gapic-bom	1m 54s
gitignore_correctness	1m 10s
generate-readme	1m 16s
owlbot-yaml	1m 8s
owlbot-py	1m 21s
root-pom	1m 51s
group_id_check_for_maps_libraries	9m 4s
	18m 55s

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