gravitational
[docs] add Google Cloud Spanner integration docs
changelog: Added documentation for Google Cloud Spanner database access
This PR adds:
- spanner database-access guide
- update database config reference
- update GUI client docs with DBeaver and DataGrip instructions for Cloud Spanner
The PR is stacked on the cloudsql guides update PR, which has changes that I made while writing this guide:
- https://github.com/gravitational/teleport/pull/41681
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