feat(confirm): add --show-output

[vahnrr]

Fixes nothing, this is a feature I found missing from a specific use case I had in mind.

Changes

Adds the --show-output flag to gum confirm which prints the prompt and the chosen action to STDOUT.

gum confirm --show-output 'Do you agree?'
# Do you agree? Yes

gum confirm --show-output 'Do you agree?'
# Do you agree? No
# exit status 1

This merge adds 2 commits, only the first one (4f9235b) is required for the feature to work.
Since the feature doesn't affect confirm/confirm.go I feel like the second (432182f) isn't necessary, but I still included it in case I misunderstood the purpose of the model structure.

[MikaelFangel]

I have added some suggestions to help fix your linting error.

Also, you can check if it passes linting before pushing by using golangci-lint run

[MikaelFangel]

Here you should remove the else and outdent the code and also the last else statement can be outdented as well.

The code will look something like this.

	}

	if o.ShowOutput {
		confirmationText := m.(model).negative
		if m.(model).confirmation {
			confirmationText = m.(model).affirmative
		}
		fmt.Println(m.(model).prompt, confirmationText)
	}

	if m.(model).confirmation {
		os.Exit(0)
	}

	os.Exit(1)

[vahnrr]

I must have missed the CI result notifications, really sorry.
This should be fixed as per you suggestions, thanks!

Regarding the model structure, do you think this commit is necessary?