🏗️ Rework project to modular pattern and interactive CLI

[pavelsvagr]

• Adds interactive CLI when no options are passed using Inquirer
• Reworks Toolbelt to Builder pattern
  • Minimal node app defined in _base starter (no api, no db, no pipeline)
  • All starter files are now copied in final dir automatically
  • package.json, container.ts, config.ts, .env.jsonc files are merged based on implemented Mergers
  • npm install is run only once at the end
  • Every starter is optional
• Rework starters to be more modular
• Adds PostgreSQL with Knex starter
• Each non-base starter has node-app.jsonc configuration
  • Defines name, id and module
  • Can define files which have interpolation placeholders (e.g. PROJECT_NAME)
  • Defines prebuild scripts for create-node-app (e.g. generate:api)

Fixes #41