Further support for custom browser specification

[john-storey-devops]

Is your feature request related to a problem? Please describe.
No, and thank you for the -b flag on force:org:open that enables a more customizable experience with sfdx.

What are you trying to do
Having both Firefox and Firefox Developer installed, the new force:org:open -b flag for "firefox" opens the standard version, whereas for development work I prefer Firefox Developer.

Also I've seen comments asking about incognito or private browser instances.

Describe the solution you'd like
Explicitly supporting all permutations of browsers and options would quickly get out of hand. Therefore a more flexible solution is needed.

Enable the user to specify, perhaps in the config hierarchy, the browser program and options to be executed. In a Windows, private-window Firefox Developer situation, the config setting could be similar to "browser": "c:/Program Files/Firefox Developer Edition/firefox.exe -private-window". The syntax for supporting folders containing spaces is TBD. Perhaps the most canonical styles could be supported.

When an sfdx command offers the -b flag, provide a -B flag that takes the "path/program -flags" syntax. sfdx force:org:open -B "c:/Program Files/Firefox Developer Edition/firefox.exe -private-window". Again that path, file name, flags syntax is TBD.

The precedence would be:

1. Command specified browser
2. Config-sourced browser
3. OS default browser

Describe alternatives you've considered
None. But I'm happy to evolve the feature with others.

Additional context
None.

[git2gus]

This issue has been linked to a new work item: W-12264011

[github-actions]

Thank you for filing this feature request. We appreciate your feedback and will review the feature at our next grooming or sprint planning session. We prioritize feature requests with more upvotes and comments.

[WillieRuemmele]

We use the open library to open the browser here

adding those flags would be pretty easy to pass to the library as arguments