Add way to collect inherited/global options from parents

[shadowspawn]

Problem

When there are global common options on the program, and subcommands using action handlers, there are options in two places. In a simple program you may have easy access to both the "program" and the "command", but that pattern is not always convenient, and does not scale very well to nested subcommands or to the action handler being passed just options.

Current:

program
  .option('-g,--global')
  .command('sub')
  .option('-l,--local')
  .action((cmd) => {
    console.log(program.global); // using program
    console.log(cmd.parent.global)); // using parent
    console.log(cmd.local);
  });

Possible Solution

@a-fas offered a routine or an option to .opt() to collect all the options:
#1024 (comment)

Enhancing .opts() is a nice idea. Adding this issue to make it visible as a possible enhancement.

e.g. trying some wording:

const opts1 = cmd.opts({ deep: true });
// or
const opts2 = cmd.opts({ collectAllOptions: true });

[shadowspawn]

Related historical: #243

[shadowspawn]

No activity in a month. I did some research and rethinking the higher level goals. Closing in favour of #1229.