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perf(orm): drop reflection from AfterPreloader collect/load path

AfterPreloader stored the element/slice reflect.Type and rebuilt the
result slice with reflect.MakeSlice + per-element reflect.ValueOf().Set(),
and compared reflect.TypeOf(v) on every Collect.

Capture the [T, Ts] type parameters in closures in NewAfterPreloader so
collecting and assembling the loaded objects needs no reflection: Collect
type-asserts v.(T), and the result is returned as T (one) or Ts (many),
matching the previous behaviour.

Change the generated code to resolve column name -> index once up front
and scan by index, reducing column resolution from per-row to once per
query.