Add rm alias to composer remove command

[dmitryuk]

Inspired from #11163
As you know most deleting|removing commands have shortcut rm, for example, rm a.txt, npm rm --help.
So I think it will be great have the same keyboard shortcut here.
p.s. composer rem is not easy to remember

[cafferata]

Would you like to change the anchor documentation link as well? 🙏

-Read more at https://getcomposer.org/doc/03-cli.md#remove
+Read more at https://getcomposer.org/doc/03-cli.md#remove-rm

https://github.com/composer/composer/blob/2.5.4/src/Composer/Command/RemoveCommand.php#L76

[dmitryuk]

Would you like to change the anchor documentation link as well? pray

-Read more at https://getcomposer.org/doc/03-cli.md#remove
+Read more at https://getcomposer.org/doc/03-cli.md#remove-rm

https://github.com/composer/composer/blob/2.5.4/src/Composer/Command/RemoveCommand.php#L76

Thanks, done

[Seldaek]

Looks good, thanks