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>
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