fix: fix decompression failed in nodejs

[GuanJdoJ]

#63

[vercel]

@GuanJdoJ is attempting to deploy a commit to the BrainTrustData Team on Vercel.

A member of the Team first needs to authorize it.

[ankrgyl]

I am working on a change that fixes this, among a few other things, more comprehensively. The change you made is close, but does not work for certain platforms (e.g. workerd) which do not decompress fetch results automatically.

Here's the fix: https://github.com/braintrustdata/braintrust-proxy/pull/68/files#diff-f9467ab4882d85829b5ae101d098958cb1f6dafcb726ed6baee1dc26a5e34e9bR300

If you want to port this logic into an independent change here, happy to review that, otherwise we will land the larger change in the next few days.

[ankrgyl]

Going to close this out since this functionality has been upstreamed.