chore: [Spanner] add gapic config json (#4888)
chore: [Spanner] add gapic config json (#4888)

* feat: update client libraries to support Database operations

PiperOrigin-RevId: 419710013

Source-Link: https://github.com/googleapis/googleapis/commit/b7c9d05c60f87c05c8701e67c6ef24699846a42d

Source-Link: https://github.com/googleapis/googleapis-gen/commit/ae498279c4e71cd4aa6e0655e92a693df97472c4
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chingor13/google-cloud-php,googleapis/google-cloud-php,chingor13/google-cloud-php,googleapis/google-cloud-php,chingor13/google-cloud-php,googleapis/google-cloud-php