feat(upload): add createChunkedUpload for resumable chunked file streaming

[deny-dz]

Summary

This PR introduces createChunkedUpload to @solid-primitives/upload:

• Resumable Chunked Multipart Streaming: Slices large files (e.g. video recordings, raw audio stems, database backups) into bounded byte chunks with customizable chunk sizes (default 5MB).
• Asynchronous Chunk Pipeline: Streams sequential chunks through custom upload handlers (e.g. Cloudflare R2 multipart uploads, AWS S3, or backend blob endpoints) with backpressure control.
• Reactive Progress Tracking: Exposes reactive progress (0–100%) and isProcessing boolean accessors.

Changes

• packages/upload/src/chunker.ts: createChunkedUpload implementation.
• packages/upload/src/index.ts: Re-export chunker utilities.
• packages/upload/test/chunker.test.ts: Vitest test suite.
• .changeset/upload-chunked-streamer.md: Minor changeset.

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🦋 Changeset detected

Latest commit: d458ed5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@solid-primitives/upload	Minor

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📒 Files selected for processing (4)

• .changeset/upload-chunked-streamer.md
• packages/upload/src/chunker.ts
• packages/upload/src/index.ts
• packages/upload/test/chunker.test.ts

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