feat: Add confirm step type

[alex-way]

Closes #953

Provides functionality to allow prompts with confirmation before proceeding with the remainder of the workflow.

Dry-run functionality will simply print a message saying that it will prompt the users with the message provided in the knope.toml configuration.

• [ ] Refactor confirm function to make testing easier
• [ ] Add unit tests
• [x] Add documentation for confirm step type
• [x] Add auto-confirmation functionality (-y in the CLI)
• [x] Add documentation for -y flag

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[alex-way]

@dbanty Would it be wise to wait until #920 is merged until adding any unit tests into this one? The core functionality is there, just tests currently missing

[dbanty]

#920 might be in limbo for a little bit—it's powering a new feature for the GitHub bot, but I don't have time to finish the feature for a few weeks 😓.