[FEATURE]: Codegen for zod schemas

### Describe what you want

I love the idea of `createInsertSchema` and `createSelectSchema`.

However, extending the Zod schemas generated by those functions and importing them in a client component, results in `drizzle-zod` and `drizzle-orm` being in the client bundle. That's more than 20 KB gzipped, afaik. Also, TypeScript has a hard time inferring the whole tree back to the table definitions.

Because of that, I propose a codegen feature for `drizzle-zod`, which would generate `z.object(...)` code (what e.g. `createInsertSchema` would produce) in a different file. This way, it can be easily imported in the client and the performance should improve as well.

What do you think?