ubus: add explicit support for deferring incoming requests

This is needed when asynchronously processing requests via uloop, e.g.
using uclient.

Example script:

  let libubus = require("ubus");
  let uloop = require("uloop");

  uloop.init();
  let ubus = libubus.connect();
  ubus.publish("test", {
      test: {
          call: function(req) {
              req.defer();
              uloop.timer(1000, () => {
                  req.reply({ msg: "Hello, world!" }, 0);
              });
          },
          args: {}
      },
  });
  uloop.run();
  uloop.done();

Signed-off-by: Felix Fietkau <nbd@nbd.name>

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