Resolve "Create end point for machine logbook"

Closes #301 (closed)

• to search machine events, we search events with investigationId is null and instrumentName is null

Info for ACU

• I've installed a test portal on dau-dm-01:3000 connected to the test DB. ACU can connect with localContact user.
• Swagger doc http://dau-dm-01:8000/api-docs/#/DataAcquisition/post_dataacquisition__apiKey__notification
• Example of event to send to ACU:

{
  "type": "broadcast",
  "tag": [
    {
      "name": "machine"
    }
  ],
  "category": "error",
  "content": [
    {
      "format": "plainText",
      "text": "beam loss!"
    }
  ],
  "source": "ebs",
  "machine": "",
  "software": ""
}

• python example: https://gitlab.esrf.fr/icat/tango-metadata/-/blob/master/src/metadata_manager/MetadataManager.py#L619
• type must be broadcast
• category could be commandline, comment, error, debug, info
• tag is optional, coudl have multiple tags
• machine could be ebs
• send also the API_KEY