[MOD2-702] Add ModerationV2Response to Message model

[vishalnarkhede]

Ticket

• https://linear.app/stream/issue/MOD2-702/extend-moderation-payload-in-sendmessage-response

Summary

• Add ModerationV2Response inner class to Message.java with fields: action, original_text, text_harms, image_harms, blocklist_matched, semantic_filter_matched
• Add moderation field to Message class so the SDK can deserialize moderation details from the SendMessage response

Context

eBay uses the Java SDK for server-side integration. The backend is being updated (companion PR) to include moderation labels in the SendMessage response for server-side requests. This SDK change allows eBay to read those fields.

Related PRs

• Chat backend: https://github.com/GetStream/chat/pull/11888
• Docs: https://github.com/GetStream/docs-content/pull/1012

Checklist

• The changed code has been covered with unit tests
• API endpoints are covered with client tests

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