Support database connections where prepared statements are unsupported

[LouisGariepy]

Migrated from halcyonnouveau/clorinde#256, originally reported by @Destructor17 on 2026-05-08.

Describe the problem

Code generated by this crate relies on support of prepared statements because many methods in tokio-postgres use prepared statements just to determine types of parameters. For example Cloudflare Hyperdrive seem to use statement-level pooling, while preparation and execution are 2 different statements, so I just keep catching database errors.

Describe the solution you'd like

Actually I implemented my own solution in halcyonnouveau#255. This issue is needed in case if original PR is rejected or becomes stale

Alternatives considered

No response

Additional context

No response

Importance

I cannot use Clorinde without it

[Destructor17]

Hi, issue author here. New PR can be found at #305.

I also want to congratulate both old and new Cornucopia maintainers with revival of this awesome project!