feat: Add backstory to chronicle API #19481

Job	Run time
generate-readme	1m 7s
gitignore_correctness	1m 13s
owlbot-py	1m 9s
package_name_check	1m 11s
gapic-bom	1m 42s
root-pom	1m 57s
owlbot-yaml	59s
group_id_check_for_maps_libraries	9m 2s
	18m 20s

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