Support http endpoint that returns available server address for auto-managed instances

[mekya]

ant-media/Ant-Media-Server#7260

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 67.99%. Comparing base (fdc9285) to head (88f8e9d).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/main/js/websocket_adaptor.js	95.74%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #549      +/-   ##
==========================================
+ Coverage   67.23%   67.99%   +0.75%     
==========================================
  Files           8        8              
  Lines        2036     2078      +42     
==========================================
+ Hits         1369     1413      +44     
+ Misses        667      665       -2     

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