✨ Add osc_send.py test script

Backup the existing osc_send.py used for demos.

Note: this MR's goal is to backup the script, which was not pushed to any Git repo that I know of. With this in mind, I don't think it is important at this stage to focus on the code quality inside, but I will let reviewers decide. However, someone else will need to make those changes, as I don't really have the time to test and develop this further.

This script allows the user to execute various movements on the floor:

• breathe: 4 identical sine waves
• waves: 4 identical sine waves, but dephased to give the feeling that there are waves on the floor
• birds: 4 identical sine waves, but dephased to give the impression that the floor is "flapping" like a bird would flap its wings
• contours: Sequential movements of all summits
• drunk: 4 sine waves with varying frequencies