Feat(medusa, cli): plugin db generate (#10988)

RESOLVES FRMW-2875

**What**
Allow to generate migration for plugins. Migration generation defer from project migration generation and therefore we choose to separate responsibility entirely.

The flow is fairly simple, the user run `npx medusa plugin:db:generate` and the script will scan for all available modules in the plugins, gather their models information and generate the appropriate migrations and snapshot (for later generation)

Co-authored-by: Harminder Virk <1706381+thetutlage@users.noreply.github.com>

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

@@ -238,6 +238,16 @@ function buildLocalCommands(cli, isLocalProject) {
         })
       ),
     })
+    .command({
+      command: "plugin:db:generate",
+      desc: "Generate migrations for a given module",
+      handler: handlerP(
+        getCommandHandler("plugin/db/generate", (args, cmd) => {
+          process.env.NODE_ENV = process.env.NODE_ENV || `development`
+          return cmd(args)
+        })
+      ),
+    })
     .command({
       command: "db:sync-links",
       desc: "Sync database schema with the links defined by your application and Medusa core",