Supports external temp sensor for Aqara E1 TRV (continues PR#3974)

[Elyasin]

Proposed change

Adds support for external temperature sensor.

Additional information

This is a continuation of #3974. The review comments have been considered in this PR. Additionally added two tests and did some refactoring.

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.27%. Comparing base (928268c) to head (32df5be).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4463      +/-   ##
==========================================
+ Coverage   92.24%   92.27%   +0.03%     
==========================================
  Files         369      369              
  Lines       12094    12142      +48     
==========================================
+ Hits        11156    11204      +48     
  Misses        938      938              

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