feat: [cloudapiregistry] new module for cloudapiregistry #15971

Job	Run time
gitignore_correctness	48s
owlbot-py	56s
root-pom	1m 26s
gapic-bom	1m 20s
generate-readme	51s
group_id_check_for_maps_libraries	6m 29s
owlbot-yaml	48s
package_name_check	49s
	13m 27s

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