RFE: Document and extend terminal autocomplete for the jmp command

[evakhoni]

Currently, basic auto-completion is possible in zsh with the following:

_JMP_COMPLETE=zsh_source jmp > ~/.jmp-complete.zsh && echo 'source ~/.jmp-complete.zsh' >> ~/.zshrc

the following improvements are suggested:

• find, verify, and document autocompletion for all supported shells
• evaluate the usefulness of implementing jmp completion subcommand, the inclusion of aliases, and dynamic completion for options
• evaluate the possibility of autocompletion for the j command (the basic completion as used for jmp doesn't work)

[evakhoni]

a quick experiment for j:

# from within jmp shell
autoload -Uz compinit && compinit && source <(_J_COMPLETE=zsh_source j)

is able to autocomplete successfully, however is throwing an exception traceback at the same time. seems like SystemExit is not handled correctly in this case.

...
...
│ │ │ /home/evakhoni/repos/jumpstarter/.venv/lib/python3.12/site-packages/click/core.py:1438   │ │ │
│ │ │ in _main_shell_completion                                                                │ │ │
│ │ │                                                                                          │ │ │
│ │ │   1435 │   │   from .shell_completion import shell_complete                              │ │ │
│ │ │   1436 │   │                                                                             │ │ │
│ │ │   1437 │   │   rv = shell_complete(self, ctx_args, prog_name, complete_var, instruction) │ │ │
│ │ │ ❱ 1438 │   │   sys.exit(rv)                                                              │ │ │
│ │ │   1439 │                                                                                 │ │ │
│ │ │   1440 │   def __call__(self, *args: t.Any, **kwargs: t.Any) -> t.Any:                   │ │ │
│ │ │   1441 │   │   """Alias for :meth:`main`."""                                             │ │ │
│ │ ╰──────────────────────────────────────────────────────────────────────────────────────────╯ │ │
│ │ SystemExit: 0                                                                                │ │
│ ╰──────────────────────────────────────────────────────────────────────────────────────────────╯ │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
                                         j
power    -- Generic power
qemu     -- Generic composite device
serial   -- Serial port client
ssh      -- Run SSH command with arguments
storage  -- Generic flasher interface
tcp      -- Generic Network Connection
tmt      -- Run TMT command with arguments