feat: Add convenience formatting caption methods.

[NFRCG]

The following PR adds convenience methods to allow caption formatting from the CommandContext for a different recipient that is not the command sender.

The benefit of this is to allow usage of the same mechanisms for formatting/sending captions for the sender AND the recipient of a command.

If there is an alternative or preferred way to achieve the same goal, please let me know and I'll close this PR.

[broccolai]

not sure about this one, you could just do this yourself by getting the CaptionFormatter / CaptionRegistry from the CommandManager. If you still think there's a good reason change this pr a little so that the old methods call this method and supply this.commandSender