feat: introduce LocationFinder

[bshaffer]

b/443774694

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• LocationFinder/samples/V1/CloudLocationFinderClient/get_cloud_location.php:25, tag cloudlocationfinder_v1_generated_CloudLocationFinder_GetCloudLocation_sync
• LocationFinder/samples/V1/CloudLocationFinderClient/list_cloud_locations.php:25, tag cloudlocationfinder_v1_generated_CloudLocationFinder_ListCloudLocations_sync
• LocationFinder/samples/V1/CloudLocationFinderClient/search_cloud_locations.php:25, tag cloudlocationfinder_v1_generated_CloudLocationFinder_SearchCloudLocations_sync

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