Access request id (packet id) from handler

[muturgan]

A metacom request body should contains a call field with a unique request identifier.
It will be great to be able to get this value at the request handler. As a second argument for example.

[tshemsedinov]

Access id by context.callId

Example:

({
  access: 'public',
  method: async () => {
    const { token, callId } = context;
    return { result: { token, callId } };
  },
});

[tshemsedinov]

#1811 (comment)