feat: [databasecenter] new module for databasecenter (#11788) #5464

Job	Run time
root-pom	1m 29s
gapic-bom	1m 27s
generate-readme	1m 0s
owlbot-py	56s
package_name_check	48s
gitignore_correctness	48s
group_id_check_for_maps_libraries	6m 20s
owlbot-yaml	46s
	13m 34s

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