Date filters fail when TimeStamp.format has un underlying value that isn't Date

[IanKeen]

Describe the bug

The @Timestamp property wrapper has an optional format: parameter which determines how the underlying value is stored.
Some formats (like .iso8601) result in types like String however when trying to query these properties in a type safe manner like:

.filter(\Model.$iso8601Property, >= someDate)

The generated SQL does not perform any allowances for the type mismatch and results in the follow error (and failed query)

operator does not exist: text >= timestamp with time zone

To Reproduce

    final class Item: Codable, Model {
        static let schema = "item"

        @ID(key: .id)
        var id: UUID?

        @Timestamp(key: "created_at", on: .create, format: .iso8601)
        var createdAt: Date?
    }

Then attempt a query like

Item.query(on: db)
   .filter(\.$createdAt >= .distantPast)
   .all()

Expected behavior

I would expect the SQL to convert the right side value to a String so the query is successful

Environment

• Fluent Framework version: 1.36.1
• OS version: 13.1 (22C65)