Add Shelly 3EM-63 Gen3 model

[thecode]

Output from /shelly:

{"name":null,"id":"shelly3em63g3-redacted","mac":"redacted","slot":1,"model":"S3EM-003CXCEU63","gen":3,"fw_id":"20241114-135317/1.4.99-3emg3prod1-g2299489","ver":"1.4.99-3emg3prod1","app":"S3EMG3","auth_en":false,"auth_domain":null,"profile":"triphase"}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.77%. Comparing base (4d04ecf) to head (31754d4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #738      +/-   ##
==========================================
+ Coverage   38.73%   38.77%   +0.04%     
==========================================
  Files          15       15              
  Lines        1451     1452       +1     
==========================================
+ Hits          562      563       +1     
  Misses        889      889              

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