Add Tuya 2-clamp power meter _TZE200_rks0sgb7

[jmuf]

Proposed change

Adds a "quirk" for the above device.

• use separate classes for AB/A/B readings, with several Bus()es as Hash
• allow to report negative power reading (under reverse load)
• use constants from ElectricalMeasurement, Metering and for divisors
• do not set voltage/current/energy multipliers, just divisors

Additional information

Fixes #2650
Outstanding issue: naming for the triplicated endpoint measurements ( #2840). This is cosmetic, devices can be manually renamed to something more meaningful.

Checklist

• The changes are tested and work correctly
• pre-commit checks pass / the code has been formatted using Black
• Tests have been added to verify that the new code works

[codecov]

Codecov Report

Attention: Patch coverage is 48.95105% with 73 lines in your changes missing coverage. Please review.

Project coverage is 86.89%. Comparing base (a2911a0) to head (f968218).
Report is 119 commits behind head on dev.

Files with missing lines	Patch %	Lines
zhaquirks/tuya/ts0601_sp_clamp_power.py	48.95%	73 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2870      +/-   ##
==========================================
- Coverage   87.50%   86.89%   -0.61%     
==========================================
  Files         292      293       +1     
  Lines        8952     9095     +143     
==========================================
+ Hits         7833     7903      +70     
- Misses       1119     1192      +73     

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