Description of the problem, including code/CLI snippet

Initial keyset pagination support was added in commit 0b71ba4, however it is still not:

• supported from CLI
• able to be set globally in configuration.

gitlab -o json project list --all --pagination keyset --order-by id

Expected Behavior

Pagination should be able to be set in the following places in order of precedence:

• cli argument
• via config file under a particular gitlab id
• via config under global section

Actual Behavior

Pagination can only be set in config file under a particular gitlab id.

Specifications

• python-gitlab version: master branch
• API version you are using (v3/v4): v4
• Gitlab server version (or gitlab.com): 13.2.3