## Description
---
1. This change introduces a userAgentRoundTripper that correctly
prepends our custom user agent to the existing User-Agent header
2. Moves sqladmin client to source.
3. Updated cloudsql tools for above support.
4. Add test cases to validate User agent.
## PR Checklist
---
> Thank you for opening a Pull Request! Before submitting your PR, there
are a
> few things you can do to make sure it goes smoothly:
- [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>
## Description
---
This pull request introduces a new tool, cloud-sql-create-users, which
allows for the creation of both built-in and IAM users in a Cloud SQL
instance.
<img width="518" height="846" alt="image"
src="https://github.com/user-attachments/assets/2f96f0be-658b-46d1-9de6-f47db2804274"
/>
<img width="518" height="956" alt="image"
src="https://github.com/user-attachments/assets/2a7d80d4-eab2-4e91-b08b-5fb78c150319"
/>
## PR Checklist
---
> Thank you for opening a Pull Request! Before submitting your PR, there
are a
> few things you can do to make sure it goes smoothly:
- [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>
