Add definitions for the Secure Power Supply

[jordancarlson08]

• Add definitions for the Secure Power Supply (labeled "Emergency power measurements" in the web interface) for voltage, current, and power.

Hello! I would like to expose some additional data from the SMA web portal through pysma to home assistant. I have added the sensors to definitions.py. I have done my best to follow existing patterns and documentation. I'm also not sure if I'm missing anything else to be able to access this data in home assistant. Any guidance would be greatly appreciated.

Thanks in advance!

[kellerza]

Thanks @jordancarlson08 ! It will be included once when we release a new pysma

[codecov[bot]]

Codecov Report

Merging #103 (96cc243) into master (415d09d) will decrease coverage by 36.06%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##            master     #103       +/-   ##
============================================
- Coverage   100.00%   63.93%   -36.07%     
============================================
  Files            6        6               
  Lines          424      427        +3     
============================================
- Hits           424      273      -151     
- Misses           0      154      +154     

Impacted Files	Coverage Δ
pysma/definitions.py	100.00% <100.00%> (ø)
pysma/__init__.py	19.04% <0.00%> (-80.96%)	:arrow_down:
pysma/sensor.py	98.88% <0.00%> (-1.12%)	:arrow_down:

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[rklomp]

@kellerza Could you check why code coverage went down with this change?