Pull-Request: Bring Python SDK (Go2 Edu) in line with Go2 V 1.1.6 high-level interface

[Jarr0d161]

Summary

This PR updates unitree_sdk2_python to the current high-level interface defined in the C++ headers shipped with Go2 firmware V 1.1.6 (May 2025).
It adds all new motion-switcher APIs, removes deprecated calls, corrects every numeric ID, and provides a clean demo script.

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Motivation

• The Go2 V 1.1.6 C++ API introduces new AI modes (FreeWalk, HandStand, ClassicWalk, …) and moves three base gaits to a new 106x block.
• The published Python SDK still targets the pre-1.1.6 interface; users hit NameError / 3203 unknown api on current robots.
• Updating the SDK ensures that Python control is feature-complete and consistent with the C++ reference.

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Changes

Module	Key updates
go2/sport/sport_api.py	* Rebuilt constant table from sport_api.hpp (IDs 1001-2058). * Added new V 2.0 IDs 2044‒2058 and aliases for StaticWalk, TrotRun, EconomicGait (1061‒1063).
go2/sport/sport_client.py	* Registers every valid ID once. * Added wrappers: HandStand, ClassicWalk, FreeBound, FreeJump, FreeAvoid, WalkUpright, CrossStep, StaticWalk, TrotRun, AutoRecoverSet/Get, SwitchAvoidMode. * Removed deprecated WalkStair.
Example go2_sport_client.py	* Interactive CLI demo covering all new commands; type list to show IDs.