Adds support for read replicas
https://orm.drizzle.team/docs/read-replicas that can be used to offload
read-heavy traffic.
To use (both `db-postgres` and `db-vercel-postgres` are supported):
```ts
import { postgresAdapter } from '@payloadcms/db-postgres'
database: postgresAdapter({
pool: {
connectionString: process.env.POSTGRES_URL,
},
readReplicas: [process.env.POSTGRES_REPLICA_URL],
})
```
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Co-authored-by: Dan Ribbens <dan.ribbens@gmail.com>
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