[Feature]: Emily API Request and Response Models

[AshtonStephens]

Feature - Emily API Request and Response Models

1. Description

This ticket is to create the request and response structures for the Emily API following the Emily HLD here.

1.1 Context & Purpose

The API needs to have structs that model the inputs and outputs of the API calls. This PR is to add those in.

2. Technical Details:

All requests and responses need any request structures and any response structures to be defined so they're automatically handled by serialization and deserialization within warp.

2.1 Acceptance Criteria:

• All request structures are defined
• All response structures are defined
• API calls are tested with unit tests
• The structures are correctly included in OpenAPI specification.
• The PR is merged.

3. Related Issues and Pull Requests (optional):

Should match this:

• Emily API Specification #69