Support Mailtrap Email Templates CRUD Functionality

[yanchuk]

Overview

Add support to the SDK for managing Email Templates in Mailtrap, based on the official API documentation and OpenAPI specification (see below).

References

• Mailtrap API Docs - Email Templates
• Mailtrap Help - Email Templates
• OpenAPI specs provided in this issue for API structure and endpoints.

Requirements

• Implement client methods for the following endpoints:
  • Get all email templates
  • Create a new email template
  • Get a template by ID
  • Update a template by ID
  • Delete a template by ID
• Ensure full request/response models are covered per OpenAPI spec.
• Add basic input validation and error handling for API responses (401, 403, 404, 422, 500).
• Provide usage examples and documentation for the Email Templates functionality.

OpenAPI Excerpt

openapi: 3.1.0
info:
  description: API for Mailtrap.io Email Templates functionality
  version: 2.0-oas3
  title: Email Templates API
...

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Please reach out in this issue if clarification is needed on API behavior or edge cases.