labgrid/driver/power: Add Tapo(Kasa) smart plug support

[onurcelep]

Description Adds power driver integration for Tapo Smart plugs with Klap authentication. python-kasa requires KASA_USERNAME and KASA_PASSWORD environment variables to be set to handle the authentication.

Checklist

• [x] Documentation for the feature
• [x] Tests for the feature

• [x] The arguments and description in doc/configuration.rst have been updated

• [ ] Add a section on how to use the feature to doc/usage.rst

• [ ] Add a section on how to use the feature to doc/development.rst

• [x] PR has been tested

• [ ] Man pages have been regenerated

[onurcelep]

Apparently available class for Tapo smart plugs is smart.SmartDevice , tried to find similar abstraction as SmartStrip but unfortunately not available :face_with_diagonal_mouth: Introducing KlapTransportV2 auth type of transport particularly brings the complexity here. I just fetched that information from debugging while using python-kasa on my local to power on/off devices