NetworkPowerPort: add support for Shelly Gen2+

[aparcar]

Description

The API changed and no longer excepts POST for the legacy API. This commit adds support for the "new" RPC API.

Ref: https://shelly-api-docs.shelly.cloud/gen2/General/RPCProtocol

Tested with a Shelly Plug S MTR Gen3

Checklist

• Documentation for the feature
  • Added in docstring
• Tests for the feature
  • Tested with real hardware

• 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

• PR has been tested

• Man pages have been regenerated

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 55.7%. Comparing base (f9d8ca0) to head (8d3ec78).
Report is 2 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
labgrid/driver/power/shelly_gen2.py	0.0%	12 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1664     +/-   ##
========================================
- Coverage    55.7%   55.7%   -0.1%     
========================================
  Files         171     172      +1     
  Lines       13408   13420     +12     
========================================
  Hits         7477    7477             
- Misses       5931    5943     +12     

Flag	Coverage Δ
3.10	55.7% <0.0%> (-0.1%)	⬇️
3.11	55.7% <0.0%> (-0.1%)	⬇️
3.12	55.7% <0.0%> (-0.1%)	⬇️
3.13	55.6% <0.0%> (-0.1%)	⬇️
3.9	55.7% <0.0%> (-0.1%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Bastian-Krause]

Thanks for the contribution. The power backend looks good. I've adjusted the commit message slightly and added a doc entry.

Since this adds support for another network PDU, see our merge policy for those: #1031. I'm gonna merge this into labgrid, but maybe it makes sense in the long run to add support for it into pdudaemon and use that.