Adding support for execution on slurm grids

- Adding support for SlurmTaskExecutor in `daggyd` if DAGGY_ENABLE_SLURM is defined.
- Renaming some test cases
- Enabling compile-time slurm support
- Adding slurm documentation

CMakeLists.txt

@@ -14,6 +14,12 @@ include(cmake/better-enums.cmake)
 include(cmake/argparse.cmake)
 include(cmake/Catch2.cmake)
 
+option(DAGGY_ENABLE_SLURM "add support for SLURM executor" ON)
+
+if (DAGGY_ENABLE_SLURM)
+    add_compile_options(-DDAGGY_ENABLE_SLURM)
+endif ()
+
 add_subdirectory(daggy)
 add_subdirectory(tests)
 add_subdirectory(utils)