[MapToParent] should inherit parent's `attributePrefix`

[JeremyCaney]

If a binding model has [MapToParent] on a property which maps to an object with a [MapToParent] on one of its properties, that grandchild property will be prefixed with the parent's property name, but not the grandparent's property name.

Example

record Location(
  string City, 
  string State
);
record Contact(
  string Name, 
  [MapToParent] Location Location
);
record Request(
  [MapToParent] Contact PrimaryContact, 
  [MapToParent] Contact SecondaryContact
);

In this case, when Request is mapped through the ReverseTopicMappingService, it will end up with:

• PrimaryContactName
• LocationCity
• LocationState
• SecondaryContactName
• LocationCity (collision)
• LocationState (collision)

Instead, the [MapToParent] on Contact should inherit the attributePrefix from the parent's [MapToParent] so you end up with:

• PrimaryContactName
• PrimaryContactLocationCity
• PrimaryContactLocationState
• SecondaryContactName
• SecondaryContactLocationCity
• SecondaryContactLocationState

Explicit attributePrefix

This should happen even if an attributePrefix is explicitly declared on the nested [MapToParent] property. So if you had:

record Contact(
  string Name, 
  [MapToParent("")] Location Location
);

Then that should output:

• PrimaryContactName
• PrimaryContactCity
• PrimaryContactState
• SecondaryContactName
• SecondaryContactCity
• SecondaryContactState