Add button to let the user refresh the daikin onecta data manually fr…

[jwillemsen]

…om the cloud

* custom_components/daikin_onecta/button.py: Added.

* custom_components/daikin_onecta/__init__.py:
* tests/test_init.py:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.25%. Comparing base (60b29bc) to head (551932b).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #372      +/-   ##
==========================================
+ Coverage   96.15%   96.25%   +0.09%     
==========================================
  Files          14       15       +1     
  Lines        1613     1654      +41     
==========================================
+ Hits         1551     1592      +41     
  Misses         62       62              

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