Allow ignoring constructor fields in `@UseRowClass`

[KiddoV]

Is your feature request related to a problem? Please describe.
When using @UseRowClass, Drift expects every constructor parameter of the row class to match a table column.

This makes it difficult to use domain models that contain:

• Relationship objects (e.g. profile, creator)
• Computed or derived fields
• Runtime-only fields

Even when those fields are not meant to be stored in the table, Drift reports:

Unexpected parameter <field> which has no matching column

Describe the solution you'd like
Allow @UseRowClass to explicitly ignore selected constructor fields.

Example API:

@UseRowClass(
  User,
  ignoreFields: {'profile', 'creator'},
)
class Users extends Table {}

or

class User {
  final String id;

  @DriftIgnore
  final Profile profile;
}

@UseRowClass(User)
class Users extends Table {}

This would tell Drift that these fields exist on the row class but are not backed by columns.

Why this is useful

• Many apps use rich domain models, not flat row-only models
• Relationships are often loaded manually via joins => Can use .copyWith() directly from the model.

[simolus3]

Unexpected parameter which has no matching column

This error is only reported for constructor parameters that are required. What would you expect drift to generate in this case? If Profile is nullable, drift can't make up a value to use. Something like this should work already:

class User {
  final String id;
  final Profile? profile;

  const User({required this.id, this.profile}]);
}

@UseRowClass(User)
class Users extends Table {
  TextColumn get id => text()();
}

And so should this:

class User {
  final String id;
  final Profile profile;

  const User({required this.id, this.profile = dummyProfile}]);
}