[Subtask] Gvfs Fuse command line Tools: support mount and umount command

[diqiu50]

Describe the subtask

1. Support mount and umount command
2. Make mount a daemon process

ubuntu$ ./gvfs-fuse
A FUSE-based file system client

Usage: gvfs-fuse <COMMAND>

Commands:
  mount
  umount
  help    Print this message or the help of the given subcommand(s)

Options:
  -h, --help     Print help
  -V, --version  Print version

ubuntu$ ./gvfs-fuse mount --help
Usage: gvfs-fuse mount [OPTIONS] <MOUNT_POINT> <LOCATION>

Arguments:
  <MOUNT_POINT>  Mount point for the filesystem
  <LOCATION>     Location of GVFS fileset URI

Options:
  -c, --config <CONFIG>
  -d, --debug <DEBUG>    Debug level [default: 0]
  -f, --foreground       Run in foreground
  -h, --help             Print help


ubuntu$ ./gvfs-fuse umount --help
Usage: gvfs-fuse umount [OPTIONS] <MOUNT_POINT>

Arguments:
  <MOUNT_POINT>  Mount point to umount

Options:
  -f, --force  Force umount
  -h, --help   Print help

Parent issue

#5504