feat: [mapmanagement] new module for mapmanagement #18225

Job	Run time
gapic-bom	1m 45s
gitignore_correctness	1m 3s
package_name_check	1m 4s
root-pom	1m 42s
owlbot-py	1m 11s
owlbot-yaml	1m 2s
generate-readme	1m 18s
group_id_check_for_maps_libraries	8m 11s
	17m 16s

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