feat: [memorystore] new module for memorystore (#11356) #13068

Job	Run time
owlbot-py	49s
owlbot-yaml	42s
gapic-bom	1m 3s
generate-readme	48s
gitignore_correctness	48s
group_id_check_for_maps_libraries	5m 50s
package_name_check	41s
root-pom	1m 4s
	11m 45s

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