CLI polish

[octref]

Description

• HYP-2438: modus new should default to YES and use Y/n instead of y/n
• HYP-2440: App Name should have a default for modus new
• HYP-2451: modus new: validate and autofix app name
• HYP-2442: modus new: Drop template option
• HYP-2439 + HYP-2473: Inquirer for SDK and default to Go
• HYP-2431: Reduce color usage on CLI help

Overall:

• Uses inquirer for user input/select
• Change the flow to:
  • SDK
  • App Name (default inferred from SDK)
  • Confirmation
• Update all y/n with defaults
• Contributing guide
• npm run watch script for dev

Checklist

• Code compiles correctly and linting passes locally
• Tests for new functionality and regression tests for bug fixes added
• Documentation added or updated
• Entry added to the CHANGELOG.md file describing and linking to this PR

Thank you for your contribution to the Modus project!