Expose Frient EMI LED reset current summation button

[TheJulianJES]

Proposed change

This exposes the Frient manufacturer-specific current_summation attribute.
A write attribute button is also added to easily reset this to 0. This is what the user will see.

Additional information

There will be no number entity to change the value, as the attribute is write-only and we'd duplicate some functionality we have in the sensor.

Advanced users can still set the current_summation to a value they want via the debug UI or a service action call.

Device diagnostics

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
• Device diagnostics data has been attached

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.26%. Comparing base (928268c) to head (86e9500).
⚠️ Report is 6 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4484      +/-   ##
==========================================
+ Coverage   92.24%   92.26%   +0.01%     
==========================================
  Files         369      371       +2     
  Lines       12094    12119      +25     
==========================================
+ Hits        11156    11181      +25     
  Misses        938      938              

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[TheJulianJES]

Works as expected. As mentioned, users can manually write the current_summation field via the "Manage Zigbee device" UI or with service calls. Most users shouldn't need to do this, however. For them, there's the simple "Reset summation delivered" button.