Get Thread Message Handler

curl --request GET \
  --url http://localhost:8000/v1/threads/{thread_id}/messages/{message_id}

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "path_part_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "sequence": 123,
  "content": {
    "text": "<string>",
    "is_error": true,
    "citations": [
      {
        "chunk_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "quote": "<string>",
        "start_char": 1,
        "length": 123,
        "document_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "document_version_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "document_name": "<string>",
        "version_number": 123,
        "path_part_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "materialized_path": "<string>"
      }
    ],
    "references": [
      {
        "ref_type": "<string>",
        "entity_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "display_name": "<string>",
        "materialized_path": "<string>"
      }
    ]
  },
  "parent_path_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "materialized_path": "<string>",
  "tenant_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "details": {
    "steps": [
      {
        "id": "<string>",
        "name": "<string>",
        "start_time": "2023-11-07T05:31:56Z",
        "args": "<string>",
        "detail": "<string>",
        "end_time": "2023-11-07T05:31:56Z",
        "steps": "<array>"
      }
    ]
  }
}