Instead of eagerly sending the join/leave packet when the user calls join/leave,
we update internal state and send the packet when the interface is polled.
Advantages:
- If the device is exhausted, the packet gets sent later instead of just failing and returning an error to the user.
- Makes the API consistent with everything else in smoltcp: operations only update internal state, poll is what sends/receives packets.
- Enables wrappers to offer simpler APIs with less generics. See https://github.com/embassy-rs/embassy/pull/3329 for an example, which is my original motivation.
This patch rebases @jgallagher's to the tip of the main branch,
adding support for IPv6 multicast groups. As in the original PR,
it is only possible to join groups by sending an initial MLDv2
Report packet. It is not yet possible to resend the change report,
leave groups, respond to queries, etc.
