Add support for Shelly devices and authentication check

[Sn0w3y]

Introduced new classes for Shelly device models and common functionalities. Implemented authentication status check and device model validation during component activation. Enhanced various Shelly device implementations to include common interface functionalities and model-specific checks. Added tests for new functionalities and updated existing tests to cover authentication checks.

Addresses Issue https://github.com/OpenEMS/openems/issues/3205

[codecov[bot]]

Codecov Report

:x: Patch coverage is 89.94083% with 17 lines in your changes missing coverage. Please review.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3399      +/-   ##
=============================================
+ Coverage      59.82%   59.89%   +0.08%     
  Complexity       112      112              
=============================================
  Files           2787     2789       +2     
  Lines         121037   121197     +160     
  Branches        9061     9067       +6     
=============================================
+ Hits           72400    72582     +182     
+ Misses         45932    45898      -34     
- Partials        2705     2717      +12     

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[sfeilmeier]

We are currently developing a lot of changes for Shelly devices, as Shelly Plug S support will be available for free for FENECON customers and we also add autodiscovery therefor. Please delay this PR after the next backport.

[sfeilmeier]

I backported our changes to Shelly (including brand new autodiscovery via mDNS) here: https://github.com/OpenEMS/openems/pull/3440.

Background: The FEMS App for Shelly Plugs will be available for free starting with FEMS version 2025.12.1