fix: allow streaming of CAR.zst files with multiple frames

[lemmih]

Summary of changes

Changes introduced in this pull request:

• multiple frames are disallowed by default but we need them for the ForestCAR.zst format.

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[ruseinov]

Looks good. Do we know if at affects anything rather than accepting multiple frames?

[lemmih]

Looks good. Do we know if at affects anything rather than accepting multiple frames?

It shouldn't. It just toggles whether the decoder ends after a single frame. The async-compression library enables it by default, so we didn't notice the problem before now.