Description of the problem, including code/CLI snippet

As nearly all commands require IDs (like project ID, issue ID, …) I would like to see global search supported in the CLI in order to be able to find those IDs.

Expected Behavior

> gitlab projects search my_project

with similar results to what this returns:

gl.search('projects','my_project')

Actual Behavior

There is nogitlab search command.

Specifications

• python-gitlab version: 2.2.0
• API version you are using (v3/v4): v4
• Gitlab server version (or gitlab.com): 12.9.5-ee