Refactoring CMake configs, adding Catch2 benchmark support

cmake/Catch2.cmake

@@ -5,3 +5,7 @@ FetchContent_Declare(
         GIT_REPOSITORY https://github.com/catchorg/Catch2.git
         GIT_TAG v2.13.7)
 FetchContent_MakeAvailable(Catch2)
+
+if (DAGGY_ENABLE_BENCHMARKS)
+  SET(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -DCATCH_CONFIG_ENABLE_BENCHMARKING")
+endif()

cmake/daggy_features.cmake

@@ -0,0 +1,18 @@
+# SLURM
+message("DAGGY_ENABLED_SLURM is set to ${DAGGY_ENABLE_SLURM}")
+if (DAGGY_ENABLE_SLURM)
+    find_library(SLURM_LIB libslurm.so libslurm.a slurm REQUIRED)
+    find_path(SLURM_INCLUDE_DIR "slurm/slurm.h" REQUIRED)
+
+    if (SLURM_LIB MATCHES ".*\.a")
+        add_library(slurm STATIC IMPORTED)
+        SET_TARGET_PROPERTIES(slurm PROPERTIES INSTALL_RPATH "$ORIGIN/../lib:$ORIGIN/")
+    else ()
+        add_library(slurm SHARED IMPORTED)
+    endif ()
+
+    set_target_properties(slurm PROPERTIES IMPORTED_LOCATION ${SLURM_LIB})
+    target_include_directories(slurm INTERFACE ${SLURM_INCLUDE_DIR})
+    target_compile_definitions(slurm INTERFACE DAGGY_ENABLE_SLURM)
+    target_link_libraries(slurm INTERFACE dl resolv)
+endif ()