Reduce macOS and Windows binary size

[friedkiwi]

Summary

• build wxWidgets as static components instead of the monolithic library on macOS and Windows
• statically link only the required wxWidgets components and disable unused subsystems
• strip the final app binary after linking on macOS and Windows

Verification

• cmake -S . -B build
• cmake --build build --target csv_explorer
• cmake -S . -B build-strip -DFETCHCONTENT_SOURCE_DIR_WXWIDGETS=/Users/friedkiwi/CLionProjects/CSV-Explorer/build/_deps/wxwidgets-src
• cmake --build build-strip --target csv_explorer
• du -sh build-strip/csv-explorer.app build-strip/csv-explorer.app/Contents/MacOS/csv-explorer