[RFC] download-commands plugin multi-shell feature

[Notarin Steele]

Greetings all,
I am a first time potential contributor, so please bear with me if I
break norm or standard.

I plan to look into contributing to the plugin download-commands.
Specifically I plan to contribute multi-shell awareness/configuration.
However I want to touch bases with the maintainers and request for
comment on the UX of the addition.
Currently there are tabs for the protocol of the git URI, so my
current best ideas are to either:

- Add a dropdown selection box for your shell of choice in the download pane.
- Add a dropdown selection box for your shell of choice in the user
settings pane.
- Compactly display the download commands grouped together by command,
displaying all shells commands in each packed group.

For some context, this was provoked by the adoption of gerrit in a
team. This is the first group that uses windows, and is as well not
quite as shell-savvy across the board as most. We found users having
more difficult onboarding when they were windows users with only
powershell, which led us into having to develop scripting solutions
for them. I as well am inconvenienced as a nushell user, however have
never to this day seen it as cause for change due to it being a simple
`&&` -> `;` change, but nonetheless it compounds with my measured
issue.

Additionally, so I may be more compliant with the expected process, a
couple questions.
Does the maintainer team prefer atomic, change-oriented, or
feature-oriented commits? (should the verbiage be poor, I mean how big
do you want my commits, or how many do you want the feature split
across)
Does the maintainer team prefer I target the master branch?
Is backporting this feature to any major version branches something I
can expect to happen?

Thank you for your time.