Cloudflare workers are missing process.env

[jakubno]

Describe the bug
When running e2b sdk in cloudflare workers the sdk throws error because process isn't defined

[khalidx]

When running on Cloudflare Workers, e2b will likely need to use the env argument provided to the handler:

export default {
  async fetch(request, env, ctx) {
    return new Response(`API host: ${env.API_HOST}`);
  }
}

A polyfill for this is a better approach (or populating process.env based on the env argument). I'll take a look/stab at it!