fix: catch unhandled errors in fromNext

[andogq]

Ensure that any errors thrown within the handler passed to fromNext are caught and emitted as unknown atoms.

Example

let thrown = false;
const s = $.fromNext(() => {
    if (!thrown) {
        thrown = true;
        throw "error";
    }

    return StreamEnd;
});

await s.toArray({ atoms: true });
// Produces: [unknown("error")]

[changeset-bot]

🦋 Changeset detected

Latest commit: af01d2f

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

This PR includes changesets to release 1 package

Name	Type
windpipe	Patch

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[giraugh]

LGTM!