feat: :sparkles: Add mDNS support to Android; remove broadcast

[zmerp]

This is part 1 of a sockets rewrite v3.

Once this PR is merged, the branch will be reused.

NB: This is the first commit in a while that bumps the protocol (-devXX)

[Meister1593]

Does not connect on pico 4 pro, but does appear in list

[Meister1593]

Actually, after a few mins it found an ip for my headset and tried to connect (there was a fluke and it couldn't do it at the time, i think unrelated)

[zmerp]

This PR is not concerned with the actual connection, only discovery. So it should work.