Fix cjs usage

[lukasIO]

closes #381

For some reason the default export gets wrongly marked as ESM for CJS. Converting the import to a named import changes the output in dist to

var import_protocol = require("@livekit/protocol");
var import_AccessToken = require("./AccessToken.cjs");
var import_digest = require("./digest.cjs");

[changeset-bot]

🦋 Changeset detected

Latest commit: 0714a2a

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

This PR includes changesets to release 2 packages

Name	Type
livekit-server-sdk	Patch
agent-dispatch	Patch

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potentially worth auditing/removing all default exports because they don't play well with esm/cjs