add flags/configuration to pepr init

[cmwylie19]

Is your feature request related to a problem? Please describe.

If you already know Pepr, going through Pepr init can be burdensome since you already know what you want. Add flags so that scaffolding a new Pepr module can happen quicker.

Describe the solution you'd like

• Given a Pepr user with knowledge of Pepr wants to scaffold a new module, or maybe even through automation
• When they initialize the new module
• Then flags or a config file is used to answer the questions in npx pepr init

Acceptance Criteria:

• When you issue npx pepr init all of the same questions can be overridden if you have flags.
• No change in behavior if flags are not used.

Describe alternatives you've considered

(optional) A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.

[samayer12]

The current prompt-based input processing happens in walkthrough.ts, and called in src/cli/index.ts