helptext: display options for parent commands

[eugene-babichenko]

This helps to understand which options are available for the given
subcommand without calling help for parent commands by providing more
informative output.

Resolves ipfs/kubo#6640

[Stebalien]

Thank you but I'm concerned that this will be too verbose in the common case (users usually don't care about the common options). Please see the design I proposed in ipfs/kubo#6640.

[eugene-babichenko]

Missed the --help-all flag, thanks for pointing that out! Will fix this soon.

[Stebalien]

Thanks!

[eugene-babichenko]

@Stebalien uploaded a couple of updates, they introduce --help-all and information on that flag in the help templates.

[Stebalien]

Thank you for trying to implement this but this needs a lot of work and needs to actually be tested against go-ipfs.

• ipfs bitswap wantlist --help-all:

USAGE
  ipfs bitswap wantlist - Show blocks currently on the wantlist.

SYNOPSIS
  ipfs bitswap wantlist 
                        [--peer=<peer> | -p]

OPTIONS

  -p, --peer  string - Specify which peer to show wantlist for. Default: self.
  
   <-- empty lines?
  
  bitswap <-- empty section.
               <-- no global flags?

DESCRIPTION

  Print out all blocks currently on the bitswap wantlist for the local peer.

• ipfs bitswap wantlist --help doesn't tell me about "--help-all" but "-h" does.
• ipfs --help-all crashes.