feat(providers/google): Add codeExecution and reasoning support in v5

[Und3rf10w]

Background

Vertex now supports extraction of thinking tokens in certain Gemini models.

When the configuration is passed via providerOptions, the sdk:

1. Did not extract reasoning tokens
2. Did not pass include_thoughts to the provider

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The google and google-vertex providers would silently drop user defined tools when used in combination with useSearchGrounding. Using useSearchGrounding in combination with user defined tools is not supported. This change throws an error if that happens.

In addition, this change also adds support for the Code Execution feature in both the Google Generative AI and Vertex providers.

Summary

• Added extraction logic to google-generative-ai package to parse reasoning tokens.
• Added a includeThoughts switch to the thinkingConfig for vertex models.

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• Throw an error when tools are used in conjunction with useSearchGrounding and useCodeExecution on the Google Generative AI and thus Vertex providers
• Added logic to call the google defined codeExecution tool, and extract the executableCode as a file part, and the codeExecutionResult as a text part.

Verification

I added and thoroughly tested examples for both providers for both reasoning and code execution. These examples exist for both stream-text and generate-text.

I have thoroughly tested the reasoning configurations and verified that we can retrieve reasoning tokens for the Vertex provider.

In addition, I discovered that for the google.generative-ai provider, you can pass BOTH useSearchGrounding and useCodeExecution, but NOT in the google.vertex provider. (See eb4bfc9)

Tasks

• Tests have been added / updated (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• A patch changeset for relevant packages has been added (for bug fixes / features - run pnpm changeset in the project root)
• Formatting issues have been fixed (run pnpm prettier-fix in the project root)

Future Work

Consider how to best handle the codeExecutionResult part. Currently, I just add it as a text part, but maybe that should be a special case. I don't know. To do this, I did change it slightly to incorporate both the outcome and the outputText, as shown here

const formattedText = `Execution Result (Outcome: ${part.codeExecutionResult.outcome}):\n${outputText}`;

Perhaps that's not the desired effect.

Related Issues

Fixes #6302
Fixes #6219
Closes #6354
Related #6359
Related #6261
Related #6428