docs(pinner): add JSDoc to public API methods, params, and types

[pcfreak30]

This pull request adds JSDoc documentation to the public API methods, parameters, and types across the pinner library. The changes cover the main Pinner SDK class, IpnsClient, WebsitesClient, UploadManager, and various supporting types and interfaces (e.g., pin options, upload inputs, CAR preprocessing, blockstore options, and the Pinata adapter interface). The documentation describes the purpose of each class, method, and parameter, improving API discoverability and developer experience without altering any functional behavior.

[kody-ai]

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