Function rebuffer

rebuffer(
a: ReadableStream<Uint8Array<ArrayBufferLike>>,
chunkSize: number,
): ReadableStream<Uint8Array<ArrayBufferLike>>
Transforms a stream of Uint8Arrays into fixed-size chunks.

Rebuffers variable-sized chunks from the input stream into consistent chunk sizes. The final chunk may be smaller if there's insufficient data. Useful for network protocols, file formats, or APIs requiring specific chunk sizes.
Parameters
- a: ReadableStream<Uint8Array<ArrayBufferLike>>
  Input ReadableStream with variable-sized Uint8Array chunks
- chunkSize: number
  Target size for output chunks in bytes
Returns ReadableStream<Uint8Array<ArrayBufferLike>>
ReadableStream emitting fixed-size chunks
Example
```
// Stream has chunks: [10 bytes], [25 bytes], [5 bytes]
const fixedChunks = rebuffer(inputStream, 16);
// Output chunks: [16 bytes], [16 bytes], [8 bytes]

// Useful for protocol framing
const framedStream = rebuffer(rawStream, 1024); // 1KB chunks
```
- Defined in utils/rebuffer.ts:109