feat!: remove logger utility functions, add server_logger example

[lukasberbuer]

Remove following logger utility functions:

constexpr std::string_view getLogLevelName(opcua::LogLevel level);
constexpr std::string_view getLogCategoryName(opcua::LogCategory category);

Add server_logger example with previous utility functions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.65%. Comparing base (bde2b4b) to head (b4de8e5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #221   +/-   ##
=======================================
  Coverage   94.65%   94.65%           
=======================================
  Files         105      105           
  Lines        5405     5405           
  Branches      720      719    -1     
=======================================
  Hits         5116     5116           
  Misses        170      170           
  Partials      119      119           

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