Migrate Goby from Boost.Filesystem to C++17 std::filesystem

[Copilot]

Now that Goby requires C++17, Boost.Filesystem is redundant and should no longer be part of runtime codepaths or exported dependency requirements. This PR replaces active filesystem usage with std::filesystem and removes the Boost filesystem component from build/package metadata.

• Code migration to std::filesystem

  • Replaced boost::filesystem includes/types/APIs in:
    • src/apps/acomms/store_server/store_server.cpp
    • src/apps/middleware/goby_tool/unified_log_tool.h
    • src/apps/middleware/log_tool/log_tool.cpp
    • src/apps/zeromq/liaison/liaison.cpp
    • src/middleware/application/configuration_reader.cpp
    • src/moos/goby_moos_app.h
  • Updated path/string handling (.native()/Boost-specific behavior) to std::filesystem equivalents.
  • Removed legacy BOOST_FILESYSTEM_VERSION conditionals that are no longer relevant.

• Build/export dependency cleanup

  • Removed filesystem from Boost component requirements in:
    • src/CMakeLists.txt
    • src/goby-config.cmake.in
  • Downstream consumers now resolve only the remaining Boost components actually used.

• Representative change

  // before
  #include <boost/filesystem.hpp>
  boost::filesystem::path p(input);
  if (boost::filesystem::exists(p)) { ... }
  
  // after
  #include <filesystem>
  std::filesystem::path p(input);
  if (std::filesystem::exists(p)) { ... }