Description of the problem, including code/CLI snippet

all the requests done in this module are syncronous. to use it more efficiently all requests should be converted to https://aiohttp.readthedocs.io/en/stable/ to make them concurrent

Expected Behavior

posibility for concurrent requests

Actual Behavior

only syncronus requests

Specifications

• python-gitlab version:
• API version you are using (v3/v4):
• Gitlab server version (or gitlab.com):