refactor: expose ColumnType to quaint::ResultSet

[Weakky]

Overview

closes https://github.com/prisma/team-orm/issues/1245

This PR adds a new types fields to quaint::ResultSet. It is a preparatory PR for the TypedSQL initiative. It helps to have a single abstraction that's used both for TypedSQL and queryRaw in general. This ensures we're always in sync between the types sent to the client at compile-time and those sent back at runtime.

For Postgres specifically, this PR adds a macro that helps keep the ColumnType and the actual Value we return at runtime in sync.

[codspeed-hq]

CodSpeed Performance Report

Merging #4960 will not alter performance

_{Comparing improve/quaint-column-type (8f704ac) with main (f66d888)}

Summary

✅ 11 untouched benchmarks

[github-actions]

WASM Query Engine file Size

Engine	This PR	Base branch	Diff
Postgres	2.057MiB	2.056MiB	1.236KiB
Postgres (gzip)	820.454KiB	820.651KiB	-202.000B
Mysql	2.027MiB	2.025MiB	2.593KiB
Mysql (gzip)	808.036KiB	808.059KiB	-24.000B
Sqlite	1.919MiB	1.918MiB	1.023KiB
Sqlite (gzip)	766.278KiB	765.963KiB	322.000B

[SevInf]

Great job, LGTM with one small nit