feat: Scaffold plugin in create-medusa-app (#10908)

RESOLVES FRMW-2862

**What**
This PR enable the `create-medusa-app` CLI to accept a new `--plugin` option to scaffold a plugin. This is complementary to all the plugin commands being created/adjusted separately to that pr.
Also, this pr brings a little refactoring around resource scaffolding, the idea was to contain the refactoring to a little area and not expend it to the entire create-medusa-app package to not disrupt and expand the scope for which the purpose was to introduce the plugin scaffolding capabilities

**Addition**
- medusa project will get their package.json name changed to the project name
- Remove build step from medusa project creation

**Plugin flow**

- in the plugin
  - `npx create-medsa-app --plugin`
  - `yarn dev`
- in the project
  - `yalc add plugin-name`
  - `yarn dev`

Any changes on the plugin will publish, push in the local registry which will fire the hot reload of the app and include the new changes from the plugin

packages/cli/create-medusa-app/src/index.ts

@@ -3,8 +3,9 @@ import { program } from "commander"
 import create from "./commands/create.js"
 
 program
-  .description("Create a new Medusa project")
+  .description("Create a new Medusa project or plugin")
   .argument("[project-name]", "Name of the project to create.")
+  .option("--plugin", "Create a plugin instead of a project.")
   .option("--repo-url <url>", "URL of repository to use to setup project.")
   .option("--seed", "Seed the created database with demo data.")
   .option(