Function is_mpi_available

pub fn is_mpi_available() -> bool

Check if laddu was compiled with MPI support (returns True if it was).

Since laddu-mpi has the same namespace as laddu (they both are imported with import laddu), this method can be used to check if MPI capabilities are available without actually running any MPI code. While functions in the laddu.mpi module will raise an ModuleNotFoundError if MPI is not supported, its sometimes convenient to have a simple boolean check rather than a try-catch block, and this method provides that.