fix(typescript): Use serializer for multipart form data when noSerde: false

[Swimburger]

Description

• Use Serde to convert types to mapped value, and JSON stringify if not already a string.
• Use Serde for named types and array/set of named types in query strings, except for aliases
  to primitive types.
  If the named type is an alias of the primitive type, use the primitive type's stringify.

This fixes multipart file uploads with JSON parts when serde is enabled.

Testing

• Seed

[amckinney]

lgtm!