Add model version to GenerateContent Output

[VinayGuthal]

This PR adds to the Firebase Android SDK's GenerateContentResponse object the output-only modelVersion string field, which enables developers to identify the exact version of the model that performed the inference.

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[github-actions]

📝 PRs merging into main branch

Our main branch should always be in a releasable state. If you are working on a larger change, or if you don't want this change to see the light of the day just yet, consider using a feature branch first, and only merge into the main branch when the code complete and ready to be released.

[rlazo]

/gemini review

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Code Review

This pull request introduces the modelVersion property to GenerateContentResponse and its internal representation, updating serialization tests and API definitions accordingly. However, a critical compilation error was introduced in GenerateContentResponse.kt where the text property declaration was accidentally deleted, leaving an orphaned code block.

[google-oss-bot]

The public api surface has changed for the subproject ai-logic_firebase-ai:
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getFunctionCalls() [RemovedMethod]
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getInlineDataParts() [RemovedMethod]
error: Added method com.google.firebase.ai.type.GenerateContentResponse.getParts() [AddedMethod]
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getText() [RemovedMethod]
error: Removed method com.google.firebase.ai.type.GenerateContentResponse.getThoughtSummary() [RemovedMethod]
error: Added class com.google.firebase.ai.type.GenerateContentResponseKt [AddedClass]

Please update the api.txt files for the subprojects being affected by this change by running ./gradlew ${subproject}:generateApiTxtFile. Also perform a major/minor bump accordingly.