Improve performance of access request creation endpoint

[neoflex]

Is your feature request related to a problem? Please describe.

The request to retrieve the form to create a new access on a dataset takes too much time to load.

Describe the solution requested
Improve response time of the endpoint

Describe possible alternatives

Other info context

Example query:

curl 'http://127.0.0.1:5050/dataset/2/access/add/'
-H 'Accept: text/html, /; q=0.01'
-H 'Accept-Language: en-US,en;q=0.9'
-H 'Connection: keep-alive'
-H 'Cookie: csrftoken=****'
-H 'DNT: 1'
-H 'Referer: http://127.0.0.1:5050/dataset/2/'
-H 'Sec-Fetch-Dest: empty'
-H 'Sec-Fetch-Mode: cors'
-H 'Sec-Fetch-Site: same-origin'
-H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36'
-H 'X-Requested-With: XMLHttpRequest'
-H 'sec-ch-ua: "Chromium";v="115", "Not/A)Brand";v="99"'
-H 'sec-ch-ua-mobile: ?0'
-H 'sec-ch-ua-platform: "macOS"'
--compressed

43s to complete!