Get KB Stats

curl --request GET \
  --url https://eu-voiceglow-runtime-vbmbkqccuq-ey.a.run.app/v3/agents/{agentId}/kb/stats \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "message": "<string>",
  "data": {
    "charCount": 123,
    "docsCount": 123
  }
}