Split bindings into separate targets.

[petrasvestartas]

Split bindings into separate targets using the following CMake workflow:

# Add the booleans module
nanobind_add_module(
    booleans_ext
    STABLE_ABI
    NB_STATIC
    src/booleans.cpp)

# Set include directories for the extension
target_include_directories(booleans_ext PRIVATE
    ${CGAL_INCLUDE_DIR}
    ${BOOST_INCLUDE_DIR}
    ${EIGEN_INCLUDE_DIR}
)

# Add the meshing module
nanobind_add_module(
    meshing_ext
    STABLE_ABI
    NB_STATIC
    src/meshing.cpp)

# Set include directories for the extension
target_include_directories(meshing_ext PRIVATE
    ${CGAL_INCLUDE_DIR}
    ${BOOST_INCLUDE_DIR}
    ${EIGEN_INCLUDE_DIR}
)

# Make sure external dependencies are downloaded before building the extension
add_dependencies(booleans_ext external_downloads)
add_dependencies(meshing_ext external_downloads)

# Install directive for scikit-build-core
install(TARGETS booleans_ext LIBRARY DESTINATION compas_cgal)
install(TARGETS meshing_ext LIBRARY DESTINATION compas_cgal)

[tomvanmele]

can we not add this _ext suffix? it is ugly :)