feat: add contact and license to GenerateOpenApiDocumentOptions

[liorp]

Summary

Resolves #156.

Extends GenerateOpenApiDocumentOptions with optional contact and license fields that map 1:1 to the OpenAPI 3.x info sub-objects:

generateOpenApiDocument(appRouter, {
  title: 'My API',
  version: '1.0.0',
  baseUrl: 'https://api.example.com',
  contact: { name: 'Engineering', email: 'team@example.com', url: 'https://example.com' },
  license: { name: 'Apache-2.0' },
});

Changes

• Added OpenApiContactObject and OpenApiLicenseObject interfaces (exported)
• Added contact? and license? fields to GenerateOpenApiDocumentOptions
• Passes them through to the info block in generateOpenApiDocument when provided
• No breaking changes — both fields are optional

Why

Redocly and other OpenAPI linters warn when info.contact is absent (info-contact rule). Previously the only workaround was post-mutating the returned document, which pushes metadata that naturally belongs in the options object into imperative code.