feat: accept in-memory upload inputs

[TalLevAmi]

Summary

• allow uploader.upload() and unsigned_upload() to accept in-memory binary inputs
• send Buffer, Uint8Array, ArrayBuffer, and Blob data directly in the multipart body instead of treating them like file paths
• update the TypeScript declarations and uploader specs for the new supported input types

Testing

• npm run dtslint
• ./node_modules/.bin/eslint lib/uploader.js test/integration/api/uploader/uploader_spec.js
• mocked local runtime validation covering Buffer, Uint8Array, ArrayBuffer, Blob, and raw buffer uploads without hitting fs.createReadStream

Notes

• docs left unchanged because the SDK docs are maintained externally and recent repo PRs for SDK surface additions have not updated README