feat: feedback API v1

[heyalexej]

Summary

Adds the Commerce Feedback API (commerce/feedback/v1), accessible via eBay.commerce.feedback. It mirrors the structure of the Message API (feat: message API v1).

Methods:

• getItemsAwaitingFeedback
• getFeedback
• leaveFeedback
• getFeedbackRatingSummary
• respondToFeedback

Changes

• Added OpenAPI spec specs/commerce_feedback_v1_beta_oas3.json, configured in redocly.yaml, generated types via openapi-typescript.
• New Feedback class (src/api/restful/commerce/feedback/index.ts) extending Restful and implementing OpenApi<operations>.
• Exported request body types LeaveFeedbackRequest and RespondToFeedbackRequest from restfulTypes.
• Wired into ApiFactory.createCommerceApi() and the Commerce group type/exports.
• Added to the OAS contract test (test/api/restful/commerce/index.ts); updated the README implementation status.

Testing

• npm test → 1373 passing (includes the new Feedback OAS contract tests).
• npm run lint and tsc --noEmit clean (noUnusedLocals/noUnusedParameters respected).
• Smoke-tested against production: all read methods (getFeedback, getFeedbackRatingSummary, getItemsAwaitingFeedback) and leaveFeedback end-to-end.

Usage:

await eBay.commerce.feedback.getFeedback({ userId, feedbackType: 'FEEDBACK_RECEIVED' });
await eBay.commerce.feedback.leaveFeedback({ commentType: 'POSITIVE', orderLineItemId, commentText });
await eBay.commerce.feedback.respondToFeedback({ feedbackId, recipientUserId, responseType: 'FOLLOW_UP', responseText });