Find all elements of tag '' and return binary data as base64 encoded string

This is a proof of concept to reenable download images using flaresolverr. I was able to test this and it will return all images on a page.

curl -s  'http://localhost:8191/v1' -H 'Content-Type: application/json' --data-raw '{
    "cmd":"request.get",
    "url":"${URL}",
    "download":"img"
}'  \
| jq -r '.solution.download[] | [.filename,.encoded_data] | join(",")' \
| while IFS=, read name data; do
    echo "$data" | base64 -d > "$name";
done

added download field to request and response.
Request field only supports "img" right now, (maybe expand to support xpath?
Response field returns array of objects containing the following fields:

[
  {
    "url": "https://cdn.example.com/uploads/img.webp",      # direct link to image
    "filename": "img.webp",                                 # image filename (last part of path in url)
    "mime_type": "image/webp",                              # mimeType
    "encoded_data":  "......"                               # base 64 encoded data
  },
   ...
]