Enable use of client/server config with ZeroMQ

[ClemensLinnhoff]

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Currently, the proxy uses the Push/Pull messaging pattern of ZeroMQ. In this PR, the Client/Server pattern was additionally implemented. The user can choose with an FMI parameter, which config he wants to use. With the Client/Server pattern, the sender waits for the receiver to be ready before sending the message.

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• My suggestion follows the governance rules.
• All commits of this PR are signed.
• My changes generate no errors when passing CI tests.
• I updated all documentation (readmes incl. figures) according to my changes.
• I have successfully implemented and tested my fix/feature locally.
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Cpp-Linter Report ⚠️

Some files did not pass the configured checks!

clang-tidy reports: 5 concern(s)

• src/OSMP.cpp

  /src/OSMP.cpp:50:16: warning: [cppcoreguidelines-avoid-non-const-global-variables]

  variable 'private_log_file' is non-const and globally accessible, consider making it const

  ofstream OSMP::private_log_file;
                 ^

• src/OSMP.h

  /src/OSMP.h:134:21: warning: [cppcoreguidelines-avoid-non-const-global-variables]

  variable 'private_log_file' is non-const and globally accessible, consider making it const

      static ofstream private_log_file;
                      ^

  /src/OSMP.h:134:21: warning: [readability-identifier-naming]

  invalid case style for class member 'private_log_file'

      static ofstream private_log_file;
                      ^~~~~~~~~~~~~~~~
                      g_private_log_file

  /src/OSMP.h:164:21: warning: [cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers]

  1024 is a magic number; consider replacing it with a named constant

          char buffer[1024];
                      ^

  /src/OSMP.h:168:27: warning: [cppcoreguidelines-avoid-magic-numbers,readability-magic-numbers]

  1024 is a magic number; consider replacing it with a named constant

          vsnprintf(buffer, 1024, format, arg);
                            ^

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