Describe the feature or problem you’d like to solve

Currently the CLI has the ability for the issues and pullrequests to output as json (#385), this is not included in the run command

e.g: gh run list --json

Proposed solution

Giving a structured output that does not need libraries like awk to pull out the valid data is helpful in many automation cases (i.e see the output of a run to use in an automation script). Adding --json will make this vastly easier

Additional Context

I looked through the current issues and did not find an issue that specifically for this, apologies if I missed one