Lab manager (IEEE video challenge)

[DharminB]

This PR adds a scenario designed for the purposes of the following IEEE video challenge: https://www.ieee-ras.org/students/events/event/1883-sac-video-challenge

The scenario addresses the first topic "How Can Robots Help During COVID-19?", such that our robot acts as a "lab manager" that:

• brings lab visitors to a disinfection station, where a disinfectant is poured by a stationary arm
• assigns sitting slots to them, or
• sends them away if the maximum number of people allowed in the lab is exceeded

The robot also recognises people and greets them in case it already knows them or asks them to register if it doesn't know them (the latter aspect is thus one-shot learning of people).

The PR includes some new features in existing functionalities, such as face recognition in the find_people action, as well as various bug fixes that were encountered during the development.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 2 Security Hotspots to review)
3 Code Smells

0.0% Coverage
0.0% Duplication

[alex-mitrevski]

I am merging this PR since we are done with the implementation, and we have already recorded and edited the video for the video challenge.