Re: [whatwg/streams] Add URL.createObjectURL(stream) support (#480)

pqnet left a comment (whatwg/streams#480)

To add my two cents, another very relevant use case is for end-to-end encryption of large files. The current workflow requires the files to be either sent decrypted by the server or to be downloaded in a blob, decrypted, then finally saved on the disk.

Anyway, I think this may be an XY problem: the current "state of the art" to trigger a download programmatically involves going through setting an URL on a DOM `<a>` element, i.e.:
```javascript
let a = document.createElement('a');
a.href = URL.createObjectURL(thing);
a.download = 'my-file.dat';
a.click();
URL.revokeObjectUrl(a.href);
``` 
Maybe just having an API to trigger a download programmatically that does not involve creating DOM elements and setting an URL on them would help solve most use cases? For example something like:
```javascript
await window.downloadStream(myStream, 'my-big-file.dat', 'application/octet-stream')
```
This would solve the problem of `createObjectURL` being leaky and the need to reset the stream for every time the URL should be downloaded.

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