Reply to status requests in sinks

[dominiklohmann]

📔 Description

This errored previously, which was most noticeable for continuous exports.

❯ vast -v quiet status --detailed | jq .sinks

[
  {
    "format": "json-writer",
    "processed": 378
  }
]

📝 Checklist

• All user-facing changes have changelog entries.
• The changes are reflected on docs.tenzir.com/vast, if necessary.
• The PR description contains instructions for the reviewer, if necessary.

🎯 Review Instructions

Read the relatively simple code. Run locally by running a continuous or unified export command and sending a status request.

[mavam]

Mind giving it a rebase?

[dominiklohmann]

Mind giving it a rebase?

Sure, done.

[mavam]

I tested this with a continuous query: vast status returns the expected output.