Adds new handle to object stores that support S3 API

[mcakircali]

Adds S3 support via AWS SDK C++

[FussyDuck]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.74%. Comparing base (2cf7ebe) to head (50e3a25).

Files with missing lines	Patch %	Lines
src/eckit/net/Endpoint.cc	0.00%	3 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #107      +/-   ##
===========================================
- Coverage    63.74%   63.74%   -0.01%     
===========================================
  Files         1066     1066              
  Lines        55360    55363       +3     
  Branches      4086     4086              
===========================================
  Hits         35289    35289              
- Misses       20071    20074       +3     

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