Treat sudo sudoedit as sudoedit with warning

[bjorn3]

This matches og-sudo: https://github.com/sudo-project/sudo/blob/fb208d383af27a07abe9cb277a620ea34c73f5d7/plugins/sudoers/sudoers.c#L1222-L1235

Fixes #1203

[squell]

With the suggestion, I think this is straightforward acceptable, but I think an even more neat solution would be to perform this check in the front-end in cli/mod.rs, since then SudoOptions is still undifferentiated.

Simply put: when the positional_args are set in place (line 735 in cli/mod.rs), check if the command being requested is sudoedit according to is_sudoedit, and if so enable the edit flag + emit the warning at that point. That feels slightly simpler.

[squell]

Note that of course it's remarkable that the CLI takes the time to parse options into a single SudoOptions, takes the time to split them out into separate option objects, and then combines the information again into the Context object. But that is a story for another time...