Use io_context instead of the deprecated io_service

[marcosbento]

• User boost::asio::bind_executor instead of the deprecated io_service::wrap()

Re ECFLOW-1973

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.83333% with 21 lines in your changes missing coverage. Please review.

Project coverage is 47.09%. Comparing base (ba31be4) to head (8eb08f0).

Files with missing lines	Patch %	Lines
libs/client/src/ecflow/client/ClientInvoker.cpp	50.00%	3 Missing ⚠️
libs/server/src/ecflow/server/SslTcpServer.cpp	0.00%	3 Missing ⚠️
libs/udp/src/ecflow/udp/UDPServer.hpp	0.00%	3 Missing ⚠️
libs/base/src/ecflow/base/SslClient.cpp	0.00%	2 Missing ⚠️
libs/base/src/ecflow/base/cts/user/PlugCmd.cpp	60.00%	2 Missing ⚠️
libs/base/src/ecflow/base/ssl_connection.cpp	0.00%	2 Missing ⚠️
libs/server/src/ecflow/server/CheckPtSaver.cpp	60.00%	2 Missing ⚠️
libs/server/src/ecflow/server/ServerMain.cpp	71.42%	2 Missing ⚠️
libs/server/src/ecflow/server/SslServer.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #115      +/-   ##
===========================================
- Coverage    47.13%   47.09%   -0.04%     
===========================================
  Files         1180     1180              
  Lines        93286    93288       +2     
  Branches     14743    14743              
===========================================
- Hits         43970    43934      -36     
- Misses       49316    49354      +38     

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