Add method livechat_inquiries_get_one

[jadolg]

I'm also adding a new fixture to test getting and taking an inquiry that creates a new inquiry and temporarily disables the automatic routing.

[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 99.31%. Comparing base (55c78b7) to head (e13e273).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #353      +/-   ##
==========================================
+ Coverage   99.30%   99.31%   +0.01%     
==========================================
  Files          42       42              
  Lines        2010     2042      +32     
  Branches      137      137              
==========================================
+ Hits         1996     2028      +32     
  Misses         10       10              
  Partials        4        4              

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