feat(robots): consolidates bi SO setups (#2780)

* feat(robots): consolidates bi SO setups

* fix(robots): solve circular dependecy

* fix(robots): teleop & record working

* feat(robots): only one SO

* fix(utils): rename bi so

* fix(scripts): bi so import

* fix(rl): remove imports

tests/robots/test_so100_follower.py

@@ -66,7 +66,7 @@ def follower():
 
     with (
         patch(
-            "lerobot.robots.so_follower.so_follower_base.FeetechMotorsBus",
+            "lerobot.robots.so_follower.so_follower.FeetechMotorsBus",
             side_effect=_bus_side_effect,
         ),
         patch.object(SO100Follower, "configure", lambda self: None),