Add work object unfurl object to Attachment.java

Work object unfurls generated from data passed in EntityMetadata.EntityPayload in chat.unfurl requests get persisted on messages as an attachment. It would be nice to add a model class representing this entity so work object data can be accessed from the Attachments object programatically

Category (place an x in each of the [ ])

• bolt (Bolt for Java)
• bolt-{sub modules} (Bolt for Java - optional modules)
• slack-api-client (Slack API Clients)
• slack-api-model (Slack API Data Models)
• slack-api-*-kotlin-extension (Kotlin Extensions for Slack API Clients)
• slack-app-backend (The primitive layer of Bolt for Java)

Requirements

Please make sure if this topic is specific to this SDK. For general questions/issues about Slack API platform or its server-side, could you submit questions at https://my.slack.com/help/requests/new instead. 🙇

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[github-actions]

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