Auto-initialize C-ares on request

[andrey-kashcheev]

Android requires having a separate call for C-ares initialization, doing it automatically on Context initialization saves a lot of issues.

No separate CMake option since it's not intended for direct use.

Relates-To: OCMAM-647

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.25%. Comparing base (6b902ab) to head (ad2192a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1645      +/-   ##
==========================================
- Coverage   80.28%   80.25%   -0.03%     
==========================================
  Files         349      349              
  Lines       14023    14022       -1     
  Branches     1513     1512       -1     
==========================================
- Hits        11257    11252       -5     
- Misses       2154     2158       +4     
  Partials      612      612              

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