fix: Deserialize custom types with inline schemas

[duncanbeevers]

🐸 Problem to be solved

Inline schemas for custom formats in path parameters are not deserialized.

The following simple schema demonstrates the behavior:

• 🥇 date-in-components is deserialized to a Date object
• ⚠️ date-inline is not deserialized to a Date object

paths:
  /users
    get:
      parameters:
        - name: date-in-components
          in: query
          schema:
            $ref: '#/components/schemas/DateTime'
        - name: date-inline
          in: query
          schema:
            type: string
            format: date-time
components:
  schemas:
    DateTime:
      type: string
      format: date-time

👑 Proposed solution

Gather path parameter custom-format schemas and augment them in the same way component schemas are.

🔧 Changes

• serdes.spec app emits summary objects as part of its GET and POST responses
• Type checks are made against response bodies (as well as existing checks in the endpoint handlers)
• query parameters declared with inline custom format schemas are deserialized to their expected custom types