Add livechat_get_appearance and livechat_set_appearance methods and raw body POST support

[jadolg]

No description provided.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.32%. Comparing base (b28a3c4) to head (14c0899).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #376   +/-   ##
=======================================
  Coverage   99.31%   99.32%           
=======================================
  Files          49       49           
  Lines        2645     2657   +12     
  Branches      154      154           
=======================================
+ Hits         2627     2639   +12     
  Misses         14       14           
  Partials        4        4           

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