Add choice flags for init command

[ieedan]

Describe the feature

Add flags for init to allow selection of style, base color, and -y flag for prompts with sensible defaults.

Why?: Nice to have if you are building automation tools such as templates that integrate the library

Proposed flags:

Usage: shadcn-svelte init [options]
 
initialize your project and install dependencies
 
Options:
  -c, --cwd <cwd>    the working directory. (default: the current directory)
  ---
  --ts                     use typescript
  -s, --style              the style ("default", "new york")
  --bc, --base-color       the base color for the components (colors...)
  --gc, ,--global-css      the global css file location
  --tc, --tailwind-config  the tailwind config location
  --ca, --component-alias  import alias for components
  --ua, --utils-alias      import alias for utils 
  ---
  -h, --help               display help for command

Happy to open a PR for this if its something you are open to!