Added select, mmap, grp, fcntl, spwd modules to the Python interpreter

## Feature Added `select`, `mmap`, `grp`, `fcntl`, `spwd` modules to the Python interpreter. ## Feature Added `fork`, `waitpid`, `chown`, `execv`, `fchmod`, `fchown`, `ftruncate`, `kill`, `lchown`, `lstat`, `readline`, `setuid` functions to the `os` module.