[v7] Bun Global Unhandled Handlers

[HazAT]

Add support for global onUnhandled Error/Promise for Bun.

import * as Sentry from "@sentry/bun";

Sentry.init({
    dsn: "DSN",
});

console.log("Hello via Bun!");

throw new Error('Unhandled Bun Sentry Error!');

ref: oven-sh/bun#5091