feat: [vectorsearch] new module for vectorsearch #15428

Job	Run time
gapic-bom	1m 26s
owlbot-py	56s
root-pom	1m 27s
package_name_check	47s
group_id_check_for_maps_libraries	6m 41s
owlbot-yaml	47s
generate-readme	53s
gitignore_correctness	47s
	13m 44s

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