.Net: Add Gemini usage metadata CachedContentTokenCount and ThoughtsTokenC…

[rodriciru]

Add missing usage variables in GeminiMetadata class

Motivation and Context

Gemini gives us CachedContentTokenCount and ThoughtsTokenCount to know how much of cost have the request.
The total input as Gemini eyes is not only PromptTokenCount, but a sum of these 3 variables.

Description

Added CachedContentTokenCount and ThoughtsTokenCount variables, filled by the response and add test.

As I am beginner in C#, I can build and pass the test, also I can make an .nupkg of the code changed, but I can't test on other projects, so PLEASE check that before submitting changes. Thank you so much

Contribution Checklist

• [X ] The code builds clean without any errors or warnings
• [X ] The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• [X ] All unit tests pass, and I have added new tests where possible
• [ X] I didn't break anyone 😄

[rodriciru]

@microsoft-github-policy-service agree El jue, 2 oct 2025, 16:11, microsoft-github-policy-service[bot] < ***@***.***> escribió:

…

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[markwallace-microsoft]

@rodriciru please run dotnet format and commit the changes