feat(genai): Add samples for count tokens generation

[cfloress]

Description

Fixes #

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Checklist

• I have followed Contributing Guidelines from CONTRIBUTING.MD
• Tests pass: go test -v ./.. (see Testing)
• Code formatted: gofmt (see Formatting)
• Vetting pass: go vet (see Formatting)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• genai/count_tokens/counttoken_localtokenizer_compute_with_txt.go:18, tag googlegenaisdk_counttoken_localtokenizer_compute_with_txt
• genai/count_tokens/counttoken_localtokenizer_with_txt.go:18, tag googlegenaisdk_counttoken_localtokenizer_with_txt

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[gemini-code-assist]

Summary of Changes

Hello @cfloress, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces new Go samples for the GenAI SDK, focusing on token counting and computation using a local tokenizer. The additions provide clear, runnable examples for developers to understand how text input is tokenized, including methods to get both total token counts and detailed token information. This update also includes necessary dependency upgrades to align with the latest GenAI SDK version.

Highlights

• New Token Counting Samples: Added two new Go samples demonstrating how to count and compute tokens using the GenAI SDK's local tokenizer with text input. These samples provide practical examples for understanding tokenization.
• Detailed Token Information: One of the new samples (countTokenLocalComputeWithTxt) showcases how to retrieve not just the total token count, but also the individual token IDs and the actual token byte representations, offering deeper insight into the tokenization process.
• Dependency Updates: The google.golang.org/genai module has been updated from v1.17.0 to v1.35.0, along with several other indirect Go dependencies, ensuring the samples use the latest library versions.

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[gemini-code-assist]

Code Review

This pull request adds new samples for counting and computing tokens using the local tokenizer, along with necessary dependency updates. The code is well-written and the new examples are a valuable addition. I have a few suggestions to improve error message clarity and reduce code duplication in the tests for better maintainability. Overall, great work.

[Guiners]

LGTM