feat(genai): Adding content cache samples

[Guiners]

Description

Fixes #

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• 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 pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow 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

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• genai/content-cache/content-cache-create-with-txt-gcs-pdf.js:17, tag googlegenaisdk_contentcache_create_with_txt_gcs_pdf
• genai/content-cache/content-cache-delete.js:17, tag googlegenaisdk_contentcache_delete
• genai/content-cache/content-cache-list.js:17, tag googlegenaisdk_contentcache_list
• genai/content-cache/content-cache-update.js:17, tag googlegenaisdk_contentcache_update
• genai/content-cache/content-cache-use-with-txt.js:17, tag googlegenaisdk_contentcache_use_with_txt

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[gemini-code-assist]

Summary of Changes

Hello @Guiners, 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 a suite of new Node.js samples for the Google GenAI SDK, specifically focusing on the content caching capabilities. The aim is to provide clear, runnable examples for developers to understand and utilize content caches for improved model performance and cost efficiency when dealing with large or frequently used contexts.

Highlights

• New Content Cache Samples: I've added a comprehensive set of new sample files demonstrating how to interact with the Google GenAI content caching feature. These samples cover creating a cache from GCS PDF files, listing existing caches, updating cache properties (like TTL), using a cache during content generation, and deleting a cache.
• Dependency Update: The luxon library has been added as a new dependency to genai/package.json to facilitate date and time manipulation for updating content cache expiration times in the samples.
• Integration Tests: New integration tests have been introduced to validate the functionality of the content cache samples, ensuring that the create, update, use, and delete operations work as expected, and that the listing of caches is functional.

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[gemini-code-assist]

Code Review

This pull request introduces new samples for content cache functionality. The changes include adding new files for creating, deleting, listing, updating, and using content caches, along with corresponding tests. The addition of luxon dependency enhances date/time handling capabilities.