[Edge] Only allow stagnant/rising _sum energy channel values

[j-eissler]

This change ensures that new values for energy channels of the _sum component can only be greater or equal. The function description of setValue() says that, but the function didn't check for it. Having decreasing energy channel values can be problematic because it breaks for example the calculation of the consumption in the history.

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Simulation

To verify this I created a simple simulation which can be run in the simulator app.
simulation_request.json

The simulation runs a constant 10kW pv inverter and a meter that switches between 2kW and 10kW
I plotted the results using a simple python script.

Result without fix

simulation_result_error.json

We can see that the ConsumptionActiveEnergy channel value does sometimes decrease when we have a higher production than usage.

Result with fix

simulation_result_fixed.json

With this fix the channel values can never drop but only increase.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

❌ Your patch check has failed because the patch coverage (50.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3298      +/-   ##
=============================================
+ Coverage      59.52%   59.54%   +0.02%     
  Complexity       113      113              
=============================================
  Files           2765     2765              
  Lines         119513   119515       +2     
  Branches        8892     8893       +1     
=============================================
+ Hits           71134    71149      +15     
+ Misses         45705    45688      -17     
- Partials        2674     2678       +4     

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