docs(storage): add comprehensive JSDoc documentation to GetSignedUrlConfig interface properties

[thiyaguk09]

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Code Review

This pull request reorganizes the properties of the GetSignedUrlConfig interface in handwritten/storage/src/file.ts and adds comprehensive JSDoc documentation to each field to improve code readability and developer experience. No review comments were provided, and there is no additional feedback.

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[gurusai-voleti]

did you follow any existing doc?

[thiyaguk09]

not exactly followed, but referred this doc https://googleapis.dev/nodejs/storage/latest/File.html#getSignedUrl

[thiyaguk09]

now update based on this doc https://googleapis.dev/nodejs/storage/latest/File.html#getSignedUrl. PTAL.