bug report: `cli.CommandsByName` not exist in v3-alpha4

[Passer6y]

Checklist

• Are you running the latest v3 release? The list of releases is here.
• Did you check the manual for your release? The v3 manual is [here] (https://github.com/urfave/cli/blob/main/docs/v3/manual.md). Could not find the manual, link points to 404
• Did you perform a search about this feature? Here's the GitHub guide about searching.

What problem does this solve?

I want to following code to sort cli command, it works in v2, but not exist in v3-alpha4

sort.Sort(cli.CommandsByName(cli.Commands))

Solution description

Describe alternatives you've considered

[dearchap]

@Passer6y You can do

rootCommand := Command{...}
sort.Sort(rootCommand.Commands)