Expose stream options on thread.post

[notkadez]

Summary

• add thread.post(message, { stream: ... }) support for public stream options
• forward Slack stream presentation options like taskDisplayMode and stopBlocks
• update docs to use the public thread.post(...) API instead of undocumented thread.stream(...)

Problem

• Docs say to use thread.stream, which is not exposed.
• There is no way to stream to slack using plan mode.

[vercel]

@notkadez is attempting to deploy a commit to the Vercel Labs Team on Vercel.

A member of the Team first needs to authorize it.

[notkadez]

@cramforce - this is ready for review when you get a chance. Let me know if there is anything blocking.

[cramforce]

@visyat Let me know if this is needed now that we have (but did we document?) PostableObject?