Cloud Spanner Extension

Cloud Spanner support in Liquibase

Summary	Cloud Spanner Extension
Current Version	https://github.com/liquibase/liquibase-spanner (forked with permission from https://github.com/cloudspannerecosystem/liquibase-spanner )
Author	Google Cloud Spanner Team
Documentation	https://docs.liquibase.com/workflows/database-setup-tutorials/cloud-spanner.html
Support	Issue tracking: https://github.com/liquibase/liquibase-spanner/issues PR tracking: https://github.com/liquibase/liquibase-spanner/pulls

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