Go2 lan auto discovery & retry in connection.py

now with go2 discovery cli https://github.com/dimensionalOS/dimos/pull/1990

we can utilize lan autodiscovery in connection.py if IP isn't specified

connection.py should also retry and not die if go2 rejects a connection attempt (since this is flakey on go2)

active question -

if we discover more then one robot, should we let a user choose? should we write a fancy configurator that has a IP selection menu? atm go2 has a clock configurator registered

unitree/go2/blueprints/basic/unitree_go2_basic.py

    .configurators(ClockSyncConfigurator())

(there is no need for configurators if annoying to implement, you can just print all IPs discovered and auto-connect to first one)

Synced from DIM-858 by summer

Start with connection.py and the Go2 discovery CLI changes in PR 1990. Read unitree/go2/blueprints/basic/unitree_go2_basic.py and its ClockSyncConfigurator registration to understand the existing configurator flow. Done means discovery works when no IP is supplied, rejected connections are retried, and the behavior for multiple discovered robots is defined.