* Add files via upload
Defined 3 high level functions to depict the action of LH, helper functions included (e.g. mix, touch_tip)
* Update action_defination.py
* Refined function and tests made on chatterbox backend.
* Refined the action, ready to use.
For now, only the on tip mode is tested.
I am a little worried about the move_to function, please pay attention to it. We may need to take the length of tip into account
* Update action_definition.py
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Co-authored-by: Junhan Chang <changjh@pku.edu.cn>
