## Description
---
This PR introduces the `cloud-sql-admin` source, which provides a client
for the Google Cloud SQL Admin API.
```
sources:
my-cloud-sql-admin:
kind: cloud-sql-admin
```
## PR Checklist
---
> Thank you for opening a Pull Request! Before submitting your PR, there
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- [x] Make sure you reviewed
[CONTRIBUTING.md](https://github.com/googleapis/genai-toolbox/blob/main/CONTRIBUTING.md)
- [x] Make sure to open an issue as a
[bug/issue](https://github.com/googleapis/genai-toolbox/issues/new/choose)
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)
- [ ] Make sure to add `!` if this involve a breaking change
🛠️ Fixes #<issue_number_goes_here>
